TY  - JOUR
AU  - Laketić, Slađana
AU  - Rakin, Marko
AU  - Momčilović, Miloš
AU  - Ciganović, Jovan
AU  - Veljović, Đorđe
AU  - Cvijović-Alagić, Ivana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/16
AB  - The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.
PB  - Springer, New York
T2  - International Journal of Minerals Metallurgy and Materials
T1  - Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser
DO  - 10.1007/s12613-020-2061-9
ER  - 

@article{
author = "Laketić, Slađana and Rakin, Marko and Momčilović, Miloš and Ciganović, Jovan and Veljović, Đorđe and Cvijović-Alagić, Ivana",
year = "2021",
abstract = "The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.",
publisher = "Springer, New York",
journal = "International Journal of Minerals Metallurgy and Materials",
title = "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser",
doi = "10.1007/s12613-020-2061-9"
}

Laketić, S., Rakin, M., Momčilović, M., Ciganović, J., Veljović, Đ.,& Cvijović-Alagić, I.. (2021). Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials
Springer, New York..
https://doi.org/10.1007/s12613-020-2061-9

Laketić S, Rakin M, Momčilović M, Ciganović J, Veljović Đ, Cvijović-Alagić I. Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials. 2021;.
doi:10.1007/s12613-020-2061-9 .

Laketić, Slađana, Rakin, Marko, Momčilović, Miloš, Ciganović, Jovan, Veljović, Đorđe, Cvijović-Alagić, Ivana, "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser" in International Journal of Minerals Metallurgy and Materials (2021),
https://doi.org/10.1007/s12613-020-2061-9 . .

TY  - JOUR
AU  - Dimitrijević, Stevan
AU  - Vurdelja, Borislava D.
AU  - Dimitrijević, Silvana
AU  - Veljković, Filip M.
AU  - Kamberović, Željko
AU  - Veličković, Suzana
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4456
AB  - Corrosion products formed on the surface of two silver brazing alloys after the potentiostatic polarization in 3.5% sodium chloride solution were characterized by the standard methods such as, the X-ray diffraction, microRaman spectroscopy, and scanning electron microscopy with energy-dispersive spectroscopy. This paper presents the results of a laser desorption/ionization mass spectrometry (LDI MS) analysis as a new approach to the characterization of corrosion products. The potential of the anodic polarization was 0.5 V versus saturated calomel electrode, and the process duration was 300 s. The corrosion layers on both investigated alloys were similar in composition with cuprous chloride and silver chloride as the main components and had strong indications of cuprous oxide formation. The major difference between these two layers was the existence of zinc hydroxychioride as the corrosion product of Ag-Cu-Zn alloy. Palladium compounds were not found in the case of Ag-Cu-Pd alloy. The results of different methods have shown a good consistency. Complementarity between the used methods was useful in the interpretation of the results for each used method. This study has demonstrated that LDI MS can be used as an efficient additional method together with the traditional ones.
PB  - Walter de Gruyter Gmbh, Berlin
T2  - Corrosion Reviews
T1  - Complementary methods for characterization of the corrosion products on the surface of Ag60Cu26Zn14 and Ag58.5Cu31.5Pd10 brazing alloys
EP  - 125
IS  - 2
SP  - 111
VL  - 38
DO  - 10.1515/corrrev-2019-0067
ER  - 

@article{
author = "Dimitrijević, Stevan and Vurdelja, Borislava D. and Dimitrijević, Silvana and Veljković, Filip M. and Kamberović, Željko and Veličković, Suzana",
year = "2020",
abstract = "Corrosion products formed on the surface of two silver brazing alloys after the potentiostatic polarization in 3.5% sodium chloride solution were characterized by the standard methods such as, the X-ray diffraction, microRaman spectroscopy, and scanning electron microscopy with energy-dispersive spectroscopy. This paper presents the results of a laser desorption/ionization mass spectrometry (LDI MS) analysis as a new approach to the characterization of corrosion products. The potential of the anodic polarization was 0.5 V versus saturated calomel electrode, and the process duration was 300 s. The corrosion layers on both investigated alloys were similar in composition with cuprous chloride and silver chloride as the main components and had strong indications of cuprous oxide formation. The major difference between these two layers was the existence of zinc hydroxychioride as the corrosion product of Ag-Cu-Zn alloy. Palladium compounds were not found in the case of Ag-Cu-Pd alloy. The results of different methods have shown a good consistency. Complementarity between the used methods was useful in the interpretation of the results for each used method. This study has demonstrated that LDI MS can be used as an efficient additional method together with the traditional ones.",
publisher = "Walter de Gruyter Gmbh, Berlin",
journal = "Corrosion Reviews",
title = "Complementary methods for characterization of the corrosion products on the surface of Ag60Cu26Zn14 and Ag58.5Cu31.5Pd10 brazing alloys",
pages = "125-111",
number = "2",
volume = "38",
doi = "10.1515/corrrev-2019-0067"
}

Dimitrijević, S., Vurdelja, B. D., Dimitrijević, S., Veljković, F. M., Kamberović, Ž.,& Veličković, S.. (2020). Complementary methods for characterization of the corrosion products on the surface of Ag60Cu26Zn14 and Ag58.5Cu31.5Pd10 brazing alloys. in Corrosion Reviews
Walter de Gruyter Gmbh, Berlin., 38(2), 111-125.
https://doi.org/10.1515/corrrev-2019-0067

Dimitrijević S, Vurdelja BD, Dimitrijević S, Veljković FM, Kamberović Ž, Veličković S. Complementary methods for characterization of the corrosion products on the surface of Ag60Cu26Zn14 and Ag58.5Cu31.5Pd10 brazing alloys. in Corrosion Reviews. 2020;38(2):111-125.
doi:10.1515/corrrev-2019-0067 .

Dimitrijević, Stevan, Vurdelja, Borislava D., Dimitrijević, Silvana, Veljković, Filip M., Kamberović, Željko, Veličković, Suzana, "Complementary methods for characterization of the corrosion products on the surface of Ag60Cu26Zn14 and Ag58.5Cu31.5Pd10 brazing alloys" in Corrosion Reviews, 38, no. 2 (2020):111-125,
https://doi.org/10.1515/corrrev-2019-0067 . .

TY  - JOUR
AU  - Milovanović, Branislav
AU  - Milovanović, Milan
AU  - Veličković, Suzana
AU  - Veljković, Filip M.
AU  - Perić-Grujić, Aleksandra
AU  - Jerosimić, Stanka
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4053
AB  - Small heterogeneous potassium-iodide clusters are investigated by means of ab initio electronic structural methods together with experimental production and detection in mass spectrometry. Experiments were done by using Knudsen cell mass spectrometry (KCMS) modification method, which provided simultaneous generating of all KnI0,+1 (n = 2-6) clusters at once. Clusters with more than two potassium atoms are produced for the first time. The lowest lying isomers of those KnI0,+1 (n = 2-6) clusters were found by using a random-kick procedure. The best description of growth of these clusters is the addition of one potassium atom to a smaller-neighbor cluster. Subsequently, stability of these species was examined. In spite of general trend of decreasing of binding energies, the closed-shell species have slightly larger stability with respect to the open-shell species. Alternation of dissociation energies between closed-shell and open-shell clusters is presented. Experimental setup also allows determination of ionization energies of clusters: the obtained values are in the range of 3.46-3.98 eV, which classify these clusters as "superalkali." For closed-shell clusters, the theoretical adiabatic ionization energies are close to experimental values, whereas in the case of open-shell clusters, the vertical ionization energies are those that are close to experimental values.
PB  - Wiley, Hoboken
T2  - International Journal of Quantum Chemistry
T1  - Theoretical and experimental investigation of geometry and stability of small potassium-iodide KnI (n=2-6) clusters
IS  - 22
VL  - 119
DO  - 10.1002/qua.26009
ER  - 

@article{
author = "Milovanović, Branislav and Milovanović, Milan and Veličković, Suzana and Veljković, Filip M. and Perić-Grujić, Aleksandra and Jerosimić, Stanka",
year = "2019",
abstract = "Small heterogeneous potassium-iodide clusters are investigated by means of ab initio electronic structural methods together with experimental production and detection in mass spectrometry. Experiments were done by using Knudsen cell mass spectrometry (KCMS) modification method, which provided simultaneous generating of all KnI0,+1 (n = 2-6) clusters at once. Clusters with more than two potassium atoms are produced for the first time. The lowest lying isomers of those KnI0,+1 (n = 2-6) clusters were found by using a random-kick procedure. The best description of growth of these clusters is the addition of one potassium atom to a smaller-neighbor cluster. Subsequently, stability of these species was examined. In spite of general trend of decreasing of binding energies, the closed-shell species have slightly larger stability with respect to the open-shell species. Alternation of dissociation energies between closed-shell and open-shell clusters is presented. Experimental setup also allows determination of ionization energies of clusters: the obtained values are in the range of 3.46-3.98 eV, which classify these clusters as "superalkali." For closed-shell clusters, the theoretical adiabatic ionization energies are close to experimental values, whereas in the case of open-shell clusters, the vertical ionization energies are those that are close to experimental values.",
publisher = "Wiley, Hoboken",
journal = "International Journal of Quantum Chemistry",
title = "Theoretical and experimental investigation of geometry and stability of small potassium-iodide KnI (n=2-6) clusters",
number = "22",
volume = "119",
doi = "10.1002/qua.26009"
}

Milovanović, B., Milovanović, M., Veličković, S., Veljković, F. M., Perić-Grujić, A.,& Jerosimić, S.. (2019). Theoretical and experimental investigation of geometry and stability of small potassium-iodide KnI (n=2-6) clusters. in International Journal of Quantum Chemistry
Wiley, Hoboken., 119(22).
https://doi.org/10.1002/qua.26009

Milovanović B, Milovanović M, Veličković S, Veljković FM, Perić-Grujić A, Jerosimić S. Theoretical and experimental investigation of geometry and stability of small potassium-iodide KnI (n=2-6) clusters. in International Journal of Quantum Chemistry. 2019;119(22).
doi:10.1002/qua.26009 .

Milovanović, Branislav, Milovanović, Milan, Veličković, Suzana, Veljković, Filip M., Perić-Grujić, Aleksandra, Jerosimić, Stanka, "Theoretical and experimental investigation of geometry and stability of small potassium-iodide KnI (n=2-6) clusters" in International Journal of Quantum Chemistry, 119, no. 22 (2019),
https://doi.org/10.1002/qua.26009 . .

TY  - CONF
AU  - Vurdelja, Borislava
AU  - Veljković, Filip
AU  - Rajčić, Boris
AU  - Dimitrijević, Silvana
AU  - Dimitrijević, Stevan
AU  - Kamberović, Željko J.
AU  - Veličković, Suzana
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6981
AB  - Precise, direct and fast methods for characterization the anodic films still have to be developed, since the conventional methods cannot be accelerated beyond the certain limits. The present work uses a laser desorption/ionization mass spectrometry (LDI MS) to characterize the chemical composition of anodic film on the Ag60Cu26Zn14 alloy. The positive mode mass spectra, measured from the propan-2-ol solution of corrosion film, shows the formation of three major signals originating from the Ag+, CuCl2CuCl(H2O)+ and Cu(OH)2(CuCl)3+ species. The other ions, such as Cu+, Cu(H2O)+, CuO(H2O)+, AgCl(H2O)+, Cu(ClO)2+, AgCuCl+, Ag2Cl(H2O)3+, have a much lower intensity. It has been noted that the ion species of zinc with chlorine or oxygen where not detected.
PB  - Bor : Mining and Metallurgy Institute
C3  - Proceedings / 50th International October Conference on Mining and Metallurgy - IOC 2018, 30th September - 3rd October 2018 Bor Lake, Serbia
T1  - CHARACTERIZATION OF THE ANODIC FILMS FORMED ON THE Ag60Cu26Zn14 ALLOY BY THE LDI MASS SPECTROMETRY
EP  - 264
SP  - 261
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6981
ER  - 

@conference{
author = "Vurdelja, Borislava and Veljković, Filip and Rajčić, Boris and Dimitrijević, Silvana and Dimitrijević, Stevan and Kamberović, Željko J. and Veličković, Suzana",
year = "2018",
abstract = "Precise, direct and fast methods for characterization the anodic films still have to be developed, since the conventional methods cannot be accelerated beyond the certain limits. The present work uses a laser desorption/ionization mass spectrometry (LDI MS) to characterize the chemical composition of anodic film on the Ag60Cu26Zn14 alloy. The positive mode mass spectra, measured from the propan-2-ol solution of corrosion film, shows the formation of three major signals originating from the Ag+, CuCl2CuCl(H2O)+ and Cu(OH)2(CuCl)3+ species. The other ions, such as Cu+, Cu(H2O)+, CuO(H2O)+, AgCl(H2O)+, Cu(ClO)2+, AgCuCl+, Ag2Cl(H2O)3+, have a much lower intensity. It has been noted that the ion species of zinc with chlorine or oxygen where not detected.",
publisher = "Bor : Mining and Metallurgy Institute",
journal = "Proceedings / 50th International October Conference on Mining and Metallurgy - IOC 2018, 30th September - 3rd October 2018 Bor Lake, Serbia",
title = "CHARACTERIZATION OF THE ANODIC FILMS FORMED ON THE Ag60Cu26Zn14 ALLOY BY THE LDI MASS SPECTROMETRY",
pages = "264-261",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6981"
}

Vurdelja, B., Veljković, F., Rajčić, B., Dimitrijević, S., Dimitrijević, S., Kamberović, Ž. J.,& Veličković, S.. (2018). CHARACTERIZATION OF THE ANODIC FILMS FORMED ON THE Ag60Cu26Zn14 ALLOY BY THE LDI MASS SPECTROMETRY. in Proceedings / 50th International October Conference on Mining and Metallurgy - IOC 2018, 30th September - 3rd October 2018 Bor Lake, Serbia
Bor : Mining and Metallurgy Institute., 261-264.
https://hdl.handle.net/21.15107/rcub_technorep_6981

Vurdelja B, Veljković F, Rajčić B, Dimitrijević S, Dimitrijević S, Kamberović ŽJ, Veličković S. CHARACTERIZATION OF THE ANODIC FILMS FORMED ON THE Ag60Cu26Zn14 ALLOY BY THE LDI MASS SPECTROMETRY. in Proceedings / 50th International October Conference on Mining and Metallurgy - IOC 2018, 30th September - 3rd October 2018 Bor Lake, Serbia. 2018;:261-264.
https://hdl.handle.net/21.15107/rcub_technorep_6981 .

Vurdelja, Borislava, Veljković, Filip, Rajčić, Boris, Dimitrijević, Silvana, Dimitrijević, Stevan, Kamberović, Željko J., Veličković, Suzana, "CHARACTERIZATION OF THE ANODIC FILMS FORMED ON THE Ag60Cu26Zn14 ALLOY BY THE LDI MASS SPECTROMETRY" in Proceedings / 50th International October Conference on Mining and Metallurgy - IOC 2018, 30th September - 3rd October 2018 Bor Lake, Serbia (2018):261-264,
https://hdl.handle.net/21.15107/rcub_technorep_6981 .

TY  - JOUR
AU  - Vurdelja, Borislava D.
AU  - Dimitrijević, Stevan P.
AU  - Dimitrijević, Silvana B.
AU  - Kamberović, Željko J.
AU  - Veličković, Suzana R.
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3656
AB  - This work is the first to demonstrate the possibilities of direct analysis of the corrosion film formed on Ag43Cu37Zn20 alloy using laser desorption/ionization (LDI) on a commercial matrix-assisted LDI time of flight mass spectrometry (MS) instrument. In the LDI mass spectra measured from the water solution of the corrosion film, the ion species Zn+, Zn(H2O)(+), AgH+, Cu2H+, Cu2O(OH)+, Cu3O(OH)(+) (high intensity), and Cu(OH)(H2O)(+), ZnCl(OH)(H2O)(+), AgCl+, CuCl+ (low intensity) were identified. The LDI mass spectra of the propan-2-ol solution of the corrosion film contains the ions Zn5Cl(OH)(3)(H2O)(11)(+), Zn5Cl2 (OH)(8) (H2O)(6)(+), and Zn5Cl2 (OH)(H2O)(14)(+). Mass spectra were observed at laser energies in the range of 1340-1860 arbitrary units in positive ion mode. Previously, Raman spectra and X-ray diffraction (XRD) analysis of the same anodic film have shown similar results as LDI MS -that the anodic film contains the mixture of Ag, Cu2O, CuCl, Zn5Cl2(OH)(8) center dot H2O, and beta-Zn(OH) Cl. LDI MS could be a complementary method for XRD and Raman, as demonstrated in this investigation. The LDI MS method greatly reduces the analysis time and amount of the sample compared to traditional methods. For this reason, the LDI MS method can be a useful tool for the fast qualitative screening of corrosion films.
PB  - Walter de Gruyter Gmbh
T2  - Corrosion Reviews
T1  - Characterization of the Ag43Cu37Zn20 alloy surface after potentiostatic polarization using LDI-TOF mass spectrometry
EP  - 481
IS  - 6
SP  - 473
VL  - 35
DO  - 10.1515/corrrev-2017-0065
ER  - 

@article{
author = "Vurdelja, Borislava D. and Dimitrijević, Stevan P. and Dimitrijević, Silvana B. and Kamberović, Željko J. and Veličković, Suzana R.",
year = "2017",
abstract = "This work is the first to demonstrate the possibilities of direct analysis of the corrosion film formed on Ag43Cu37Zn20 alloy using laser desorption/ionization (LDI) on a commercial matrix-assisted LDI time of flight mass spectrometry (MS) instrument. In the LDI mass spectra measured from the water solution of the corrosion film, the ion species Zn+, Zn(H2O)(+), AgH+, Cu2H+, Cu2O(OH)+, Cu3O(OH)(+) (high intensity), and Cu(OH)(H2O)(+), ZnCl(OH)(H2O)(+), AgCl+, CuCl+ (low intensity) were identified. The LDI mass spectra of the propan-2-ol solution of the corrosion film contains the ions Zn5Cl(OH)(3)(H2O)(11)(+), Zn5Cl2 (OH)(8) (H2O)(6)(+), and Zn5Cl2 (OH)(H2O)(14)(+). Mass spectra were observed at laser energies in the range of 1340-1860 arbitrary units in positive ion mode. Previously, Raman spectra and X-ray diffraction (XRD) analysis of the same anodic film have shown similar results as LDI MS -that the anodic film contains the mixture of Ag, Cu2O, CuCl, Zn5Cl2(OH)(8) center dot H2O, and beta-Zn(OH) Cl. LDI MS could be a complementary method for XRD and Raman, as demonstrated in this investigation. The LDI MS method greatly reduces the analysis time and amount of the sample compared to traditional methods. For this reason, the LDI MS method can be a useful tool for the fast qualitative screening of corrosion films.",
publisher = "Walter de Gruyter Gmbh",
journal = "Corrosion Reviews",
title = "Characterization of the Ag43Cu37Zn20 alloy surface after potentiostatic polarization using LDI-TOF mass spectrometry",
pages = "481-473",
number = "6",
volume = "35",
doi = "10.1515/corrrev-2017-0065"
}

Vurdelja, B. D., Dimitrijević, S. P., Dimitrijević, S. B., Kamberović, Ž. J.,& Veličković, S. R.. (2017). Characterization of the Ag43Cu37Zn20 alloy surface after potentiostatic polarization using LDI-TOF mass spectrometry. in Corrosion Reviews
Walter de Gruyter Gmbh., 35(6), 473-481.
https://doi.org/10.1515/corrrev-2017-0065

Vurdelja BD, Dimitrijević SP, Dimitrijević SB, Kamberović ŽJ, Veličković SR. Characterization of the Ag43Cu37Zn20 alloy surface after potentiostatic polarization using LDI-TOF mass spectrometry. in Corrosion Reviews. 2017;35(6):473-481.
doi:10.1515/corrrev-2017-0065 .

Vurdelja, Borislava D., Dimitrijević, Stevan P., Dimitrijević, Silvana B., Kamberović, Željko J., Veličković, Suzana R., "Characterization of the Ag43Cu37Zn20 alloy surface after potentiostatic polarization using LDI-TOF mass spectrometry" in Corrosion Reviews, 35, no. 6 (2017):473-481,
https://doi.org/10.1515/corrrev-2017-0065 . .

TY  - JOUR
AU  - Veljković, Filip M.
AU  - Perić-Grujić, Aleksandra
AU  - Veličković, Suzana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3244
AB  - Knudsen effusion mass spectrometry or high-temperature method of mass spectrometry for decades gives new information about saturated vapor of hardly volatile compounds and it is an important method in the discovery of many new molecules, radicals, ions and clusters present in the gas phase. Since pioneering works until now, this method has been successfully applied to a large number of systems (ores, oxides, ceramics, glass materials, borides, carbides, sulfides, nitrates, metals, fullerenes, etc.) which led to the establishment of various research branches such as chemistry of clusters. This paper describes the basic principles of Knudsen cell use for both identification of chemical species created in the process of evaporation and determination of their ionization energies. Depending on detected ions intensities and the partial pressure of each gaseous component, as well as on changes in partial pressure with temperature, Knudsen cell mass spectrometry enables the determination of thermodynamic parameters of the tested system. A special attention is paid to its application in the field of small heterogeneous and homogeneous clusters of alkali metals. Furthermore, experimental results for thermodynamic parameters of some clusters, as well as capabilities of non-standard ways of using Knudsen cells in the process of synthesis of new clusters are presented herein.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Mass spectrometric production of heterogeneous metal clusters using knudsen cell
EP  - 637
IS  - 6
SP  - 629
VL  - 70
DO  - 10.2298/HEMIND150922070V
ER  - 

@article{
author = "Veljković, Filip M. and Perić-Grujić, Aleksandra and Veličković, Suzana",
year = "2016",
abstract = "Knudsen effusion mass spectrometry or high-temperature method of mass spectrometry for decades gives new information about saturated vapor of hardly volatile compounds and it is an important method in the discovery of many new molecules, radicals, ions and clusters present in the gas phase. Since pioneering works until now, this method has been successfully applied to a large number of systems (ores, oxides, ceramics, glass materials, borides, carbides, sulfides, nitrates, metals, fullerenes, etc.) which led to the establishment of various research branches such as chemistry of clusters. This paper describes the basic principles of Knudsen cell use for both identification of chemical species created in the process of evaporation and determination of their ionization energies. Depending on detected ions intensities and the partial pressure of each gaseous component, as well as on changes in partial pressure with temperature, Knudsen cell mass spectrometry enables the determination of thermodynamic parameters of the tested system. A special attention is paid to its application in the field of small heterogeneous and homogeneous clusters of alkali metals. Furthermore, experimental results for thermodynamic parameters of some clusters, as well as capabilities of non-standard ways of using Knudsen cells in the process of synthesis of new clusters are presented herein.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Mass spectrometric production of heterogeneous metal clusters using knudsen cell",
pages = "637-629",
number = "6",
volume = "70",
doi = "10.2298/HEMIND150922070V"
}

Veljković, F. M., Perić-Grujić, A.,& Veličković, S.. (2016). Mass spectrometric production of heterogeneous metal clusters using knudsen cell. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 70(6), 629-637.
https://doi.org/10.2298/HEMIND150922070V

Veljković FM, Perić-Grujić A, Veličković S. Mass spectrometric production of heterogeneous metal clusters using knudsen cell. in Hemijska industrija. 2016;70(6):629-637.
doi:10.2298/HEMIND150922070V .

Veljković, Filip M., Perić-Grujić, Aleksandra, Veličković, Suzana, "Mass spectrometric production of heterogeneous metal clusters using knudsen cell" in Hemijska industrija, 70, no. 6 (2016):629-637,
https://doi.org/10.2298/HEMIND150922070V . .

TY  - JOUR
AU  - Petronić, Sanja
AU  - Burzić, Meri
AU  - Milovanović, Dubravka
AU  - Čolić, Katarina
AU  - Radovanović, Željko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2956
AB  - Laser welding is a welding process with a high energy density and numerous advantages over conventional welding methods (narrow heat affected zone, lower heat input, less distortion, and the like.) Mechanical treatment laser is an innovative technique for improving the properties of fatigue resistance, abrasion and corrosion resistance. In this paper, mechanically processed by laser two groups of samples; base materials and laser welded joints. Sheets made of Ni superalloy 2mm thick -millisecond Nd: YAG laser, while the mechanical treatment made picosecond Nd: YAG laser. Welds are tensile tested, and microstructure was observed by optical and scanning electron microscopy. The microhardness was measured by Vickers method with a load of 10 N.
AB  - Lasersko zavarivanje je proces zavarivanja sa velikom gustinom energije i mnogobrojnim prednostima u odnosu na konvencionalne metode zavarivanja (uska zona uticaja toplote, manji unos toplote, manja distorzija i sl.) Mehanička obrada laserom je inovativna tehnika kojom se poboljšavaju karakteristike otpornosti na zamor, habanje i otpornost na koroziju. U ovom radu, mehanički su obrađene laserom dve grupe uzoraka; osnovnog materijala i laserski zavarenih spojeva. Limovi superlegure debljine 2mm su zavareni milisekundnim Nd:YAG laserom, dok je mehanička obada obavljena pikosekundnim Nd:YAG laserom. Zavareni spojevi su ispitani zatezanjem, a mikrostruktura je posmatrana optičkim i skenirajućim elektronskim mikroskopom. Mikrotvrdoća je merena po Vikersu sa opterećenjem od 10 N.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy
T1  - Mehanička obrada pikosekundnim laserom osnovnog materijala i zavarenih spojeva legure Nimonik 263
EP  - 155
IS  - 4
SP  - 149
VL  - 60
DO  - 10.5937/zzk1504149P
ER  - 

@article{
author = "Petronić, Sanja and Burzić, Meri and Milovanović, Dubravka and Čolić, Katarina and Radovanović, Željko",
year = "2015",
abstract = "Laser welding is a welding process with a high energy density and numerous advantages over conventional welding methods (narrow heat affected zone, lower heat input, less distortion, and the like.) Mechanical treatment laser is an innovative technique for improving the properties of fatigue resistance, abrasion and corrosion resistance. In this paper, mechanically processed by laser two groups of samples; base materials and laser welded joints. Sheets made of Ni superalloy 2mm thick -millisecond Nd: YAG laser, while the mechanical treatment made picosecond Nd: YAG laser. Welds are tensile tested, and microstructure was observed by optical and scanning electron microscopy. The microhardness was measured by Vickers method with a load of 10 N., Lasersko zavarivanje je proces zavarivanja sa velikom gustinom energije i mnogobrojnim prednostima u odnosu na konvencionalne metode zavarivanja (uska zona uticaja toplote, manji unos toplote, manja distorzija i sl.) Mehanička obrada laserom je inovativna tehnika kojom se poboljšavaju karakteristike otpornosti na zamor, habanje i otpornost na koroziju. U ovom radu, mehanički su obrađene laserom dve grupe uzoraka; osnovnog materijala i laserski zavarenih spojeva. Limovi superlegure debljine 2mm su zavareni milisekundnim Nd:YAG laserom, dok je mehanička obada obavljena pikosekundnim Nd:YAG laserom. Zavareni spojevi su ispitani zatezanjem, a mikrostruktura je posmatrana optičkim i skenirajućim elektronskim mikroskopom. Mikrotvrdoća je merena po Vikersu sa opterećenjem od 10 N.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy, Mehanička obrada pikosekundnim laserom osnovnog materijala i zavarenih spojeva legure Nimonik 263",
pages = "155-149",
number = "4",
volume = "60",
doi = "10.5937/zzk1504149P"
}

Petronić, S., Burzić, M., Milovanović, D., Čolić, K.,& Radovanović, Ž.. (2015). Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 60(4), 149-155.
https://doi.org/10.5937/zzk1504149P

Petronić S, Burzić M, Milovanović D, Čolić K, Radovanović Ž. Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy. in Zavarivanje i zavarene konstrukcije. 2015;60(4):149-155.
doi:10.5937/zzk1504149P .

Petronić, Sanja, Burzić, Meri, Milovanović, Dubravka, Čolić, Katarina, Radovanović, Željko, "Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy" in Zavarivanje i zavarene konstrukcije, 60, no. 4 (2015):149-155,
https://doi.org/10.5937/zzk1504149P . .

TY  - JOUR
AU  - Doncheva, Elisaveta
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2937
AB  - This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials.
AB  - U ovom radu se razmatraju numeričke simulacije na bazi elastoplastičnih konačnih elemenata kod nelinearnih naponskih analiza zateznih epruveta sa prslinom, od materijala povišene čvrstoće. Uticaj geometrije prsline na otpornost prema lomu je razmatran u numeričkoj analizi na modelima sa dve različite prsline. Rezultati parametara loma su dobijeni kako za simulaciju zateznih ploča različitih dužina prsline i širina, koje čine tzv. kratke i duge prsline. Poređenjem dobijenih numeričkih rezultata za otpornost na lom zateznih epruveta sa rezultatima odgovarajućih eksperimentalnih ispitivanja epruveta istih oblika i osobina materijala, kao i poređenje sa rezultatima dobijenim sličnim standardnim eksperimentalnim postupcima, pokazuje se da pravilna kombinacija numeričkih i eksperimentalnih procedura može usmeriti istraživanje u dobijanju mnogo preciznijih rezultata u istraživanju svojstava otpornosti na lom materijala.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel
T1  - Analiza parametara otpornosti na lom metodom konačnih elemenata, kod stacionarnih polueliptičnih prslina u čeliku povišene čvrstoće
EP  - 134
IS  - 3
SP  - 131
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2937
ER  - 

@article{
author = "Doncheva, Elisaveta and Međo, Bojan and Sedmak, Aleksandar",
year = "2015",
abstract = "This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials., U ovom radu se razmatraju numeričke simulacije na bazi elastoplastičnih konačnih elemenata kod nelinearnih naponskih analiza zateznih epruveta sa prslinom, od materijala povišene čvrstoće. Uticaj geometrije prsline na otpornost prema lomu je razmatran u numeričkoj analizi na modelima sa dve različite prsline. Rezultati parametara loma su dobijeni kako za simulaciju zateznih ploča različitih dužina prsline i širina, koje čine tzv. kratke i duge prsline. Poređenjem dobijenih numeričkih rezultata za otpornost na lom zateznih epruveta sa rezultatima odgovarajućih eksperimentalnih ispitivanja epruveta istih oblika i osobina materijala, kao i poređenje sa rezultatima dobijenim sličnim standardnim eksperimentalnim postupcima, pokazuje se da pravilna kombinacija numeričkih i eksperimentalnih procedura može usmeriti istraživanje u dobijanju mnogo preciznijih rezultata u istraživanju svojstava otpornosti na lom materijala.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel, Analiza parametara otpornosti na lom metodom konačnih elemenata, kod stacionarnih polueliptičnih prslina u čeliku povišene čvrstoće",
pages = "134-131",
number = "3",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2937"
}

Doncheva, E., Međo, B.,& Sedmak, A.. (2015). Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 15(3), 131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937

Doncheva E, Međo B, Sedmak A. Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Integritet i vek konstrukcija. 2015;15(3):131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

Doncheva, Elisaveta, Međo, Bojan, Sedmak, Aleksandar, "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel" in Integritet i vek konstrukcija, 15, no. 3 (2015):131-134,
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

TY  - JOUR
AU  - Veljković, Filip M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
AU  - Perić-Grujić, Aleksandra
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2140
AB  - RATIONALE The very small clusters of the type KnF are of particular importance since their first ionization energies (IEs) are lower than those of the alkali metal atoms. Theoretical calculation has demonstrated that this kind of cluster represents a potential 'building block' for cluster-assembly materials with unique structural, electronic, optical, magnetic, and thermodynamic properties. To date, however, there have been no experimental results on the IEs of KnF (n  gt 2) clusters. METHOD KnF (n?=?26) clusters were produced by the evaporation of a solid potassium fluoride salt using a modified thermal ionization source of modified design, and mass selected by a magnetic sector mass spectrometer where their IEs were determined. RESULTS Clusters KnF (n?=?36) were detected for the first time. The order of the ion intensities was K2F+ gt ? gt ?K4F+ gt ? gt ?K3F+K6F+? gt ?K5F+. The determined IEs were 3.99 +/- 0.20?eV for K2F, 4.16 +/- 0.20?eV for K3F, 4.27 +/- 0.20?eV for K4F, 4.22 +/- 0.20?eV for K5F, and 4.31 +/- 0.20?eV for K6F. The IEs of KnF increase slightly with the increase in potassium atom number from 2 to 6. We also observed that the presence of a fluorine atom leads to increasing ionization energy of bare metal potassium clusters. CONCLUSIONS The modified thermal ionization source provides an efficient way of obtaining the fluorine-doped potassium clusters. These results also present experimental proof that KnF (n?=?26) clusters belong to the group of 'superalkali' species.
PB  - Wiley, Hoboken
T2  - Rapid Communications in Mass Spectrometry
T1  - Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry
EP  - 1766
IS  - 16
SP  - 1761
VL  - 26
DO  - 10.1002/rcm.6284
ER  - 

@article{
author = "Veljković, Filip M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Veličković, Suzana and Perić-Grujić, Aleksandra",
year = "2012",
abstract = "RATIONALE The very small clusters of the type KnF are of particular importance since their first ionization energies (IEs) are lower than those of the alkali metal atoms. Theoretical calculation has demonstrated that this kind of cluster represents a potential 'building block' for cluster-assembly materials with unique structural, electronic, optical, magnetic, and thermodynamic properties. To date, however, there have been no experimental results on the IEs of KnF (n  gt 2) clusters. METHOD KnF (n?=?26) clusters were produced by the evaporation of a solid potassium fluoride salt using a modified thermal ionization source of modified design, and mass selected by a magnetic sector mass spectrometer where their IEs were determined. RESULTS Clusters KnF (n?=?36) were detected for the first time. The order of the ion intensities was K2F+ gt ? gt ?K4F+ gt ? gt ?K3F+K6F+? gt ?K5F+. The determined IEs were 3.99 +/- 0.20?eV for K2F, 4.16 +/- 0.20?eV for K3F, 4.27 +/- 0.20?eV for K4F, 4.22 +/- 0.20?eV for K5F, and 4.31 +/- 0.20?eV for K6F. The IEs of KnF increase slightly with the increase in potassium atom number from 2 to 6. We also observed that the presence of a fluorine atom leads to increasing ionization energy of bare metal potassium clusters. CONCLUSIONS The modified thermal ionization source provides an efficient way of obtaining the fluorine-doped potassium clusters. These results also present experimental proof that KnF (n?=?26) clusters belong to the group of 'superalkali' species.",
publisher = "Wiley, Hoboken",
journal = "Rapid Communications in Mass Spectrometry",
title = "Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry",
pages = "1766-1761",
number = "16",
volume = "26",
doi = "10.1002/rcm.6284"
}

Veljković, F. M., Đustebek, J. B., Veljković, M. V., Veličković, S.,& Perić-Grujić, A.. (2012). Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry
Wiley, Hoboken., 26(16), 1761-1766.
https://doi.org/10.1002/rcm.6284

Veljković FM, Đustebek JB, Veljković MV, Veličković S, Perić-Grujić A. Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry. in Rapid Communications in Mass Spectrometry. 2012;26(16):1761-1766.
doi:10.1002/rcm.6284 .

Veljković, Filip M., Đustebek, Jasmina B., Veljković, Miomir V., Veličković, Suzana, Perić-Grujić, Aleksandra, "Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry" in Rapid Communications in Mass Spectrometry, 26, no. 16 (2012):1761-1766,
https://doi.org/10.1002/rcm.6284 . .

TY  - JOUR
AU  - Veljković, Filip M.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Perić-Grujić, Aleksandra
AU  - Veličković, Suzana
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2122
AB  - The theoretical calculations have predicted that nonmetal-doped potassium clusters can be used in the synthesis of a new class of charge-transfer salts which can be considered as potential building blocks for the assembly of novel nanostructured material. In this work, KnCl (n?=?26) and KnCln-1 (n?=?3 and 4) clusters were produced by vaporization of a solid potassium chloride salt in a thermal ionization mass spectrometry. The ionization energies (IEs) were measured, and found to be 3.64?+/-?0.20?eV for K2Cl, 3.67?+/-?0.20?eV for K3Cl, 3.62?+/-?0.20?eV for K4Cl, 3.57?+/-?0.20?eV for K5Cl, 3.69?+/-?0.20?eV for K6Cl, 3.71?+/-?0.20?eV for K3Cl2 and 3.72?+/-?0.20?eV for K4Cl3. The KnCl+ (n?=?36) clusters were detected for the first time in a cluster beam generated by the thermal ionization source of modified design. Also, this work is the first to report experimentally obtained values of IEs for KnCl+ (n?=?36) and KnCln-1+ (n?=?3 and 4) clusters. The ionization energies for KnCl+ and KnCln-1+ clusters are much lower than the 4.34?eV of the potassium atom; hence, these clusters should be classified as superalkali species.
PB  - Wiley, Hoboken
T2  - Journal of Mass Spectrometry
T1  - Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry
EP  - 1499
IS  - 11
SP  - 1495
VL  - 47
DO  - 10.1002/jms.3076
ER  - 

@article{
author = "Veljković, Filip M. and Đustebek, Jasmina B. and Veljković, Miomir V. and Perić-Grujić, Aleksandra and Veličković, Suzana",
year = "2012",
abstract = "The theoretical calculations have predicted that nonmetal-doped potassium clusters can be used in the synthesis of a new class of charge-transfer salts which can be considered as potential building blocks for the assembly of novel nanostructured material. In this work, KnCl (n?=?26) and KnCln-1 (n?=?3 and 4) clusters were produced by vaporization of a solid potassium chloride salt in a thermal ionization mass spectrometry. The ionization energies (IEs) were measured, and found to be 3.64?+/-?0.20?eV for K2Cl, 3.67?+/-?0.20?eV for K3Cl, 3.62?+/-?0.20?eV for K4Cl, 3.57?+/-?0.20?eV for K5Cl, 3.69?+/-?0.20?eV for K6Cl, 3.71?+/-?0.20?eV for K3Cl2 and 3.72?+/-?0.20?eV for K4Cl3. The KnCl+ (n?=?36) clusters were detected for the first time in a cluster beam generated by the thermal ionization source of modified design. Also, this work is the first to report experimentally obtained values of IEs for KnCl+ (n?=?36) and KnCln-1+ (n?=?3 and 4) clusters. The ionization energies for KnCl+ and KnCln-1+ clusters are much lower than the 4.34?eV of the potassium atom; hence, these clusters should be classified as superalkali species.",
publisher = "Wiley, Hoboken",
journal = "Journal of Mass Spectrometry",
title = "Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry",
pages = "1499-1495",
number = "11",
volume = "47",
doi = "10.1002/jms.3076"
}

Veljković, F. M., Đustebek, J. B., Veljković, M. V., Perić-Grujić, A.,& Veličković, S.. (2012). Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry. in Journal of Mass Spectrometry
Wiley, Hoboken., 47(11), 1495-1499.
https://doi.org/10.1002/jms.3076

Veljković FM, Đustebek JB, Veljković MV, Perić-Grujić A, Veličković S. Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry. in Journal of Mass Spectrometry. 2012;47(11):1495-1499.
doi:10.1002/jms.3076 .

Veljković, Filip M., Đustebek, Jasmina B., Veljković, Miomir V., Perić-Grujić, Aleksandra, Veličković, Suzana, "Study of small chlorine-doped potassium clusters by thermal ionization mass spectrometry" in Journal of Mass Spectrometry, 47, no. 11 (2012):1495-1499,
https://doi.org/10.1002/jms.3076 . .

TY  - JOUR
AU  - Demajo, Miroslav A.
AU  - Cvetićanin, Jelena M.
AU  - Stoiljković, Milovan
AU  - Trpkov, Đorđe
AU  - Andrić, Velibor
AU  - Onjia, Antonije
AU  - Nešković, Olivera M.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1903
AB  - In this study, we analysed pellets from long-eared owls (Asio otus) collected from four localities in Belgrade (Serbia). The pellets contained the remains of prey, namely voles (Arvicola terrestris) and field mice (Apodemus agrarius). The concentrations of 14 elements (Ca, P, Mg, Na, K, Fe, Zn, Sr, Ba, Mn, Ti, Cu, Si, B) were evaluated in whole pellets and in samples containing only bone tissue, which were dissected from the whole pellet. The increased levels of certain elements, including Mn, Zn, Ba, Cu and radioactive K-40, indicate contamination of the soil by various sources, such as industrial plants and agricultural practices. From the results presented in this article, we suggest that the analysis of owl pellets may indicate the quality of the local environment.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Chemistry and Ecology
T1  - Detection of elements and radioactivity in pellets from long-eared owls (Asio otus) inhabiting the city of Belgrade (Serbia)
EP  - 400
IS  - 5
SP  - 393
VL  - 27
DO  - 10.1080/02757540.2011.607440
ER  - 

@article{
author = "Demajo, Miroslav A. and Cvetićanin, Jelena M. and Stoiljković, Milovan and Trpkov, Đorđe and Andrić, Velibor and Onjia, Antonije and Nešković, Olivera M.",
year = "2011",
abstract = "In this study, we analysed pellets from long-eared owls (Asio otus) collected from four localities in Belgrade (Serbia). The pellets contained the remains of prey, namely voles (Arvicola terrestris) and field mice (Apodemus agrarius). The concentrations of 14 elements (Ca, P, Mg, Na, K, Fe, Zn, Sr, Ba, Mn, Ti, Cu, Si, B) were evaluated in whole pellets and in samples containing only bone tissue, which were dissected from the whole pellet. The increased levels of certain elements, including Mn, Zn, Ba, Cu and radioactive K-40, indicate contamination of the soil by various sources, such as industrial plants and agricultural practices. From the results presented in this article, we suggest that the analysis of owl pellets may indicate the quality of the local environment.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Chemistry and Ecology",
title = "Detection of elements and radioactivity in pellets from long-eared owls (Asio otus) inhabiting the city of Belgrade (Serbia)",
pages = "400-393",
number = "5",
volume = "27",
doi = "10.1080/02757540.2011.607440"
}

Demajo, M. A., Cvetićanin, J. M., Stoiljković, M., Trpkov, Đ., Andrić, V., Onjia, A.,& Nešković, O. M.. (2011). Detection of elements and radioactivity in pellets from long-eared owls (Asio otus) inhabiting the city of Belgrade (Serbia). in Chemistry and Ecology
Taylor & Francis Ltd, Abingdon., 27(5), 393-400.
https://doi.org/10.1080/02757540.2011.607440

Demajo MA, Cvetićanin JM, Stoiljković M, Trpkov Đ, Andrić V, Onjia A, Nešković OM. Detection of elements and radioactivity in pellets from long-eared owls (Asio otus) inhabiting the city of Belgrade (Serbia). in Chemistry and Ecology. 2011;27(5):393-400.
doi:10.1080/02757540.2011.607440 .

Demajo, Miroslav A., Cvetićanin, Jelena M., Stoiljković, Milovan, Trpkov, Đorđe, Andrić, Velibor, Onjia, Antonije, Nešković, Olivera M., "Detection of elements and radioactivity in pellets from long-eared owls (Asio otus) inhabiting the city of Belgrade (Serbia)" in Chemistry and Ecology, 27, no. 5 (2011):393-400,
https://doi.org/10.1080/02757540.2011.607440 . .

TY  - JOUR
AU  - Veličković, Suzana
AU  - Veljković, Filip M.
AU  - Perić-Grujić, Aleksandra
AU  - Radak, Bojan
AU  - Veljković, Miomir V.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1859
AB  - The electronic structure and properties of dipotassiummonohalides are important for understanding the unique physical and chemical behavior of MnX systems. In the present study, K2X (here X=F, Cl, Br, I) clusters were generated in the vapor over salts of the corresponding potassium halide, using a magnetic sector thermal ionization mass spectrometer. The ionization energies obtained for K2F, K2Cl, K2Br, and K2I molecules were 3.82 +/- 0.1eV, 3.68 +/- 0.1eV, 3.95 +/- 0.1eV, and 3.92 +/- 0.1, respectively. These experimental values of ionization energies for K2X (X=F, Br, and I) are presented for the first time. The ionization energy of K2Cl determined by thermal ionization corresponds to previous results obtained by photoionization mass spectrometry, and it agrees with the theoretical ionization energy calculated by the ab initio method. The presently obtained results support previous theoretical predictions that the excess electron in dipotassiummonohalide clusters is delocalized over two potassium atoms, which is characteristic for F-center clusters.
PB  - Wiley, Hoboken
T2  - Rapid Communications in Mass Spectrometry
T1  - Ionization energies of K2X (X=F, Cl, Br, I) clusters
EP  - 2332
IS  - 16
SP  - 2327
VL  - 25
DO  - 10.1002/rcm.5128
ER  - 

@article{
author = "Veličković, Suzana and Veljković, Filip M. and Perić-Grujić, Aleksandra and Radak, Bojan and Veljković, Miomir V.",
year = "2011",
abstract = "The electronic structure and properties of dipotassiummonohalides are important for understanding the unique physical and chemical behavior of MnX systems. In the present study, K2X (here X=F, Cl, Br, I) clusters were generated in the vapor over salts of the corresponding potassium halide, using a magnetic sector thermal ionization mass spectrometer. The ionization energies obtained for K2F, K2Cl, K2Br, and K2I molecules were 3.82 +/- 0.1eV, 3.68 +/- 0.1eV, 3.95 +/- 0.1eV, and 3.92 +/- 0.1, respectively. These experimental values of ionization energies for K2X (X=F, Br, and I) are presented for the first time. The ionization energy of K2Cl determined by thermal ionization corresponds to previous results obtained by photoionization mass spectrometry, and it agrees with the theoretical ionization energy calculated by the ab initio method. The presently obtained results support previous theoretical predictions that the excess electron in dipotassiummonohalide clusters is delocalized over two potassium atoms, which is characteristic for F-center clusters.",
publisher = "Wiley, Hoboken",
journal = "Rapid Communications in Mass Spectrometry",
title = "Ionization energies of K2X (X=F, Cl, Br, I) clusters",
pages = "2332-2327",
number = "16",
volume = "25",
doi = "10.1002/rcm.5128"
}

Veličković, S., Veljković, F. M., Perić-Grujić, A., Radak, B.,& Veljković, M. V.. (2011). Ionization energies of K2X (X=F, Cl, Br, I) clusters. in Rapid Communications in Mass Spectrometry
Wiley, Hoboken., 25(16), 2327-2332.
https://doi.org/10.1002/rcm.5128

Veličković S, Veljković FM, Perić-Grujić A, Radak B, Veljković MV. Ionization energies of K2X (X=F, Cl, Br, I) clusters. in Rapid Communications in Mass Spectrometry. 2011;25(16):2327-2332.
doi:10.1002/rcm.5128 .

Veličković, Suzana, Veljković, Filip M., Perić-Grujić, Aleksandra, Radak, Bojan, Veljković, Miomir V., "Ionization energies of K2X (X=F, Cl, Br, I) clusters" in Rapid Communications in Mass Spectrometry, 25, no. 16 (2011):2327-2332,
https://doi.org/10.1002/rcm.5128 . .