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  - 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 . .

TY  - JOUR
AU  - Cvetićanin, Jelena M.
AU  - Veličković, Suzana
AU  - Đorđević, Vesna R.
AU  - Đustebek, Jasmina B.
AU  - Veljković, Miomir V.
AU  - Perić-Grujić, Aleksandra
AU  - Nešković, Olivera M.
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1322
AB  - Using the ion implantation technique (introducing negatively charged fullerene into a low temperature lithium plasma column by a strong axial magnetic field) endohedral fullerenes Li"C-70, Li-2"C-70 and Li-3"C-70 were produced. Mass spectral studies (both TIMS-thermal ionization mass spectrometry and MALDI TOF MS - matrix assisted laser desorption ionization time-of-flight mass spectrometry) of these endohedral fullerenes provided detailed structural and reactivity information about these unusual species. The fragmentation of the obtained ions is shown to be by a multiple C-2 loss (shrink-wrap mechanism). According to the fact that more atoms in the fullerene make the produced endohedral less stable, Li-3"C-70 shows a big degree of instability. The presence of Li-3"C-70 was observed on MALDI TOF MS.
PB  - Natl Inst Optoelectronics, Bucharest-Magurele
T2  - Journal of Optoelectronics and Advanced Materials
T1  - TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes
EP  - 1507
IS  - 6
SP  - 1505
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3472
ER  - 

@article{
author = "Cvetićanin, Jelena M. and Veličković, Suzana and Đorđević, Vesna R. and Đustebek, Jasmina B. and Veljković, Miomir V. and Perić-Grujić, Aleksandra and Nešković, Olivera M.",
year = "2008",
abstract = "Using the ion implantation technique (introducing negatively charged fullerene into a low temperature lithium plasma column by a strong axial magnetic field) endohedral fullerenes Li"C-70, Li-2"C-70 and Li-3"C-70 were produced. Mass spectral studies (both TIMS-thermal ionization mass spectrometry and MALDI TOF MS - matrix assisted laser desorption ionization time-of-flight mass spectrometry) of these endohedral fullerenes provided detailed structural and reactivity information about these unusual species. The fragmentation of the obtained ions is shown to be by a multiple C-2 loss (shrink-wrap mechanism). According to the fact that more atoms in the fullerene make the produced endohedral less stable, Li-3"C-70 shows a big degree of instability. The presence of Li-3"C-70 was observed on MALDI TOF MS.",
publisher = "Natl Inst Optoelectronics, Bucharest-Magurele",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes",
pages = "1507-1505",
number = "6",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3472"
}

Cvetićanin, J. M., Veličković, S., Đorđević, V. R., Đustebek, J. B., Veljković, M. V., Perić-Grujić, A.,& Nešković, O. M.. (2008). TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes. in Journal of Optoelectronics and Advanced Materials
Natl Inst Optoelectronics, Bucharest-Magurele., 10(6), 1505-1507.
https://hdl.handle.net/21.15107/rcub_vinar_3472

Cvetićanin JM, Veličković S, Đorđević VR, Đustebek JB, Veljković MV, Perić-Grujić A, Nešković OM. TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes. in Journal of Optoelectronics and Advanced Materials. 2008;10(6):1505-1507.
https://hdl.handle.net/21.15107/rcub_vinar_3472 .

Cvetićanin, Jelena M., Veličković, Suzana, Đorđević, Vesna R., Đustebek, Jasmina B., Veljković, Miomir V., Perić-Grujić, Aleksandra, Nešković, Olivera M., "TIMS and MALDI TOF of endohedral Li-n"C-70 (n=1-3) metallofullerenes" in Journal of Optoelectronics and Advanced Materials, 10, no. 6 (2008):1505-1507,
https://hdl.handle.net/21.15107/rcub_vinar_3472 .

TY  - JOUR
AU  - Perić-Grujić, Aleksandra
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Laušević, Zoran
AU  - Laušević, Mila
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1150
AB  - In this work, the influence of silver and palladium on the surface of undoped, boron doped and phosphorus doped glassy carbon has been studied. The silver and palladium concentrations in solution, after metal deposition, were measured by atomic absorption spectrophotometer. The morphology of metal coatings was characterized by scanning electron microscopy. In order to investigate the nature and thermal stability of surface oxygen groups, temperature-programmed desorption method combined with mass spectrometric analyses, was performed. The results obtained have shown that silver and palladium spontaneously deposit from their salt solutions at the surface of glassy carbon samples. Silver deposits have dendrite structure, whilst palladium forms separate clusters. The highest amount of both silver and palladium deposits at the surface of sample containing the highest quantity of surface oxide complexes. It has been concluded that carboxyl groups and structure defects are responsible for metal reduction. Calculated desorption energies have shown that the surface modification by metal deposition leads to the formation of more stable surface of undoped and doped glassy carbon samples.
PB  - Indian Acad Sciences, Bangalore
T2  - Bulletin of Materials Science
T1  - Surface characterization of silver and palladium modified glassy carbon
EP  - 593
IS  - 6
SP  - 587
VL  - 30
DO  - 10.1007/s12034-007-0093-7
ER  - 

@article{
author = "Perić-Grujić, Aleksandra and Nešković, Olivera M. and Veljković, Miomir V. and Laušević, Zoran and Laušević, Mila",
year = "2007",
abstract = "In this work, the influence of silver and palladium on the surface of undoped, boron doped and phosphorus doped glassy carbon has been studied. The silver and palladium concentrations in solution, after metal deposition, were measured by atomic absorption spectrophotometer. The morphology of metal coatings was characterized by scanning electron microscopy. In order to investigate the nature and thermal stability of surface oxygen groups, temperature-programmed desorption method combined with mass spectrometric analyses, was performed. The results obtained have shown that silver and palladium spontaneously deposit from their salt solutions at the surface of glassy carbon samples. Silver deposits have dendrite structure, whilst palladium forms separate clusters. The highest amount of both silver and palladium deposits at the surface of sample containing the highest quantity of surface oxide complexes. It has been concluded that carboxyl groups and structure defects are responsible for metal reduction. Calculated desorption energies have shown that the surface modification by metal deposition leads to the formation of more stable surface of undoped and doped glassy carbon samples.",
publisher = "Indian Acad Sciences, Bangalore",
journal = "Bulletin of Materials Science",
title = "Surface characterization of silver and palladium modified glassy carbon",
pages = "593-587",
number = "6",
volume = "30",
doi = "10.1007/s12034-007-0093-7"
}

Perić-Grujić, A., Nešković, O. M., Veljković, M. V., Laušević, Z.,& Laušević, M.. (2007). Surface characterization of silver and palladium modified glassy carbon. in Bulletin of Materials Science
Indian Acad Sciences, Bangalore., 30(6), 587-593.
https://doi.org/10.1007/s12034-007-0093-7

Perić-Grujić A, Nešković OM, Veljković MV, Laušević Z, Laušević M. Surface characterization of silver and palladium modified glassy carbon. in Bulletin of Materials Science. 2007;30(6):587-593.
doi:10.1007/s12034-007-0093-7 .

Perić-Grujić, Aleksandra, Nešković, Olivera M., Veljković, Miomir V., Laušević, Zoran, Laušević, Mila, "Surface characterization of silver and palladium modified glassy carbon" in Bulletin of Materials Science, 30, no. 6 (2007):587-593,
https://doi.org/10.1007/s12034-007-0093-7 . .

TY  - JOUR
AU  - Perić-Grujić, Aleksandra
AU  - Vasiljević, Tatjana
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Laušević, Zoran
AU  - Laušević, Mila
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/958
AB  - The effects of boron and phosphorus incorporation in phenolic resin precursor to the oxidation resistance of glassy carbon have been studied. In order to reveal the nature and composition of the oxygen complexes formed at the surface of doped glassy carbon, under controlled atmosphere, the surface of the samples was cleaned under vacuum up to 1273 K. Specific functional groups, subsequently formed under dry CO2 or O-2 atmosphere on the surface of boron-doped and phosphorus-doped glassy carbon samples, were examined using the temperature-programmed desorption method combined with mass spectrometric analysis. Characterization of surface properties of undoped and doped samples has shown that in the presence of either boron or phosphorus heteroatoms, a lower amount of oxygen complexes formed after CO2 exposure, while, typically, higher amount of oxygen complexes formed after O-2 exposure. It has been concluded that the surface of undoped glassy carbon has a greater affinity towards CO2, while in the presence of either boron or phosphorus heteroatoms, the glassy carbon surface affinity becomes greater towards O-2, under experimental conditions.
PB  - Indian Acad Sciences, Bangalore
T2  - Bulletin of Materials Science
T1  - Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon
EP  - 473
IS  - 5
SP  - 467
VL  - 29
DO  - 10.1007/BF02914077
ER  - 

@article{
author = "Perić-Grujić, Aleksandra and Vasiljević, Tatjana and Nešković, Olivera M. and Veljković, Miomir V. and Laušević, Zoran and Laušević, Mila",
year = "2006",
abstract = "The effects of boron and phosphorus incorporation in phenolic resin precursor to the oxidation resistance of glassy carbon have been studied. In order to reveal the nature and composition of the oxygen complexes formed at the surface of doped glassy carbon, under controlled atmosphere, the surface of the samples was cleaned under vacuum up to 1273 K. Specific functional groups, subsequently formed under dry CO2 or O-2 atmosphere on the surface of boron-doped and phosphorus-doped glassy carbon samples, were examined using the temperature-programmed desorption method combined with mass spectrometric analysis. Characterization of surface properties of undoped and doped samples has shown that in the presence of either boron or phosphorus heteroatoms, a lower amount of oxygen complexes formed after CO2 exposure, while, typically, higher amount of oxygen complexes formed after O-2 exposure. It has been concluded that the surface of undoped glassy carbon has a greater affinity towards CO2, while in the presence of either boron or phosphorus heteroatoms, the glassy carbon surface affinity becomes greater towards O-2, under experimental conditions.",
publisher = "Indian Acad Sciences, Bangalore",
journal = "Bulletin of Materials Science",
title = "Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon",
pages = "473-467",
number = "5",
volume = "29",
doi = "10.1007/BF02914077"
}

Perić-Grujić, A., Vasiljević, T., Nešković, O. M., Veljković, M. V., Laušević, Z.,& Laušević, M.. (2006). Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon. in Bulletin of Materials Science
Indian Acad Sciences, Bangalore., 29(5), 467-473.
https://doi.org/10.1007/BF02914077

Perić-Grujić A, Vasiljević T, Nešković OM, Veljković MV, Laušević Z, Laušević M. Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon. in Bulletin of Materials Science. 2006;29(5):467-473.
doi:10.1007/BF02914077 .

Perić-Grujić, Aleksandra, Vasiljević, Tatjana, Nešković, Olivera M., Veljković, Miomir V., Laušević, Zoran, Laušević, Mila, "Formation of oxygen complexes in controlled atmosphere at surface of doped glassy carbon" in Bulletin of Materials Science, 29, no. 5 (2006):467-473,
https://doi.org/10.1007/BF02914077 . .

TY  - JOUR
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Veličković, Suzana
AU  - Petkovska, LT
AU  - Perić-Grujić, Aleksandra
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/559
AB  - Ionization energies of hypervalent Li2F, Li2Cl and Na2Cl molecules detected by surface ionization electron impact neutralization mass spectrometry are reported. The ionization energies were 3.78 +/- 0.2 eV for Li2F, 4.93 +/- 0.2 eV for Li2Cl, and 4.21 +/- 0.2 eV for Na2Cl. The ionization energies (IE) agree with theoretical ionization energies calculated by ab initio methods,(1) supporting the theoretical prediction that Li2F has a hyperlithiated configuration in which the odd electron delocalizes over the two lithiums and with photoionization measurement.(2) The first ionization energy of Na2Cl was experimentally confirmed earlier(3-7) and for Li2Cl as well.(8) We have developed and used this new approach for the problem-in the present work ions were first formed by surface ionization, followed by electron attachment (neutralization).
PB  - John Wiley & Sons Ltd, W Sussex
T2  - Rapid Communications in Mass Spectrometry
T1  - Ionization energies of hypervalent Li2F, Li2Cl and Na2Cl molecules obtained by surface ionization electron impact neutralization mass spectrometry
EP  - 214
IS  - 3
SP  - 212
VL  - 17
DO  - 10.1002/rcm.896
ER  - 

@article{
author = "Nešković, Olivera M. and Veljković, Miomir V. and Veličković, Suzana and Petkovska, LT and Perić-Grujić, Aleksandra",
year = "2003",
abstract = "Ionization energies of hypervalent Li2F, Li2Cl and Na2Cl molecules detected by surface ionization electron impact neutralization mass spectrometry are reported. The ionization energies were 3.78 +/- 0.2 eV for Li2F, 4.93 +/- 0.2 eV for Li2Cl, and 4.21 +/- 0.2 eV for Na2Cl. The ionization energies (IE) agree with theoretical ionization energies calculated by ab initio methods,(1) supporting the theoretical prediction that Li2F has a hyperlithiated configuration in which the odd electron delocalizes over the two lithiums and with photoionization measurement.(2) The first ionization energy of Na2Cl was experimentally confirmed earlier(3-7) and for Li2Cl as well.(8) We have developed and used this new approach for the problem-in the present work ions were first formed by surface ionization, followed by electron attachment (neutralization).",
publisher = "John Wiley & Sons Ltd, W Sussex",
journal = "Rapid Communications in Mass Spectrometry",
title = "Ionization energies of hypervalent Li2F, Li2Cl and Na2Cl molecules obtained by surface ionization electron impact neutralization mass spectrometry",
pages = "214-212",
number = "3",
volume = "17",
doi = "10.1002/rcm.896"
}

Nešković, O. M., Veljković, M. V., Veličković, S., Petkovska, L.,& Perić-Grujić, A.. (2003). Ionization energies of hypervalent Li2F, Li2Cl and Na2Cl molecules obtained by surface ionization electron impact neutralization mass spectrometry. in Rapid Communications in Mass Spectrometry
John Wiley & Sons Ltd, W Sussex., 17(3), 212-214.
https://doi.org/10.1002/rcm.896

Nešković OM, Veljković MV, Veličković S, Petkovska L, Perić-Grujić A. Ionization energies of hypervalent Li2F, Li2Cl and Na2Cl molecules obtained by surface ionization electron impact neutralization mass spectrometry. in Rapid Communications in Mass Spectrometry. 2003;17(3):212-214.
doi:10.1002/rcm.896 .

Nešković, Olivera M., Veljković, Miomir V., Veličković, Suzana, Petkovska, LT, Perić-Grujić, Aleksandra, "Ionization energies of hypervalent Li2F, Li2Cl and Na2Cl molecules obtained by surface ionization electron impact neutralization mass spectrometry" in Rapid Communications in Mass Spectrometry, 17, no. 3 (2003):212-214,
https://doi.org/10.1002/rcm.896 . .

TY  - JOUR
AU  - Perić-Grujić, Aleksandra
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Laušević, Mila
AU  - Laušević, Zoran
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/428
AB  - The temperature-programmed desorption (TPD) method combined with mass spectrometric (MS) analysis has been applied to investigate the surface properties of carbon materials. The apparatus consisting of a temperature-programmed furnace and a quadrupole mass spectrometer was constructed in order to characterize the surface of differently treated glassy carbon samples. In this work, samples of glassy carbon exposed to air, CO2 and O2 were examined. The desorption of H2O,CO and CO2, as major products, indicated the presence of different oxide groups. The amount of these groups for all samples was calculated. It is concluded that oxidation affects the nature and the amount of the surface oxide groups and contributes to their increased stability.
AB  - Za ispitivanja površinskih karakteristika ugljeničnih materijala, konstruisan je uređaj za temperaturski programiranu desorpciju sa masenospektrometrijskim detektorom pomoću koga se prate desorpcioni produkti razlaganja površinskih oksidnih kompleksa. Pri tome je moguće vršiti njihovu kvalitativnu i kvantitativnu analizu. U okviru ovog rada ispitan je uticaj oksidacije ugljen-dioksidom, odnosno kiseonikom, na površinske osobine staklastog karbona, jer je on sintetički ugljenični materijal čija primena u velikoj meri zavisi od njegovih površinskih osobina. Desorpcija vode ugljen-monoksida i ugljen-dioksida, kao glavnih desorpcionih produkata ukazala je na prisustvo različitih količina, različitih oksidnih grupa na površini ispitanih uzoraka. Rezultati su pokazali da oksidacija ugljen-dioksidom, odnosno kiseonikom dovodi do smanjenja broja oksidnih grupa koje se razlažu na temperaturama ispod 1000 K, kao i do formiranja stabilnijih grupa koje se razlažu na višim temperaturama.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - TPD-MS study of glassy carbon surfaces oxidized by CO2 and O2
T1  - Maseno spektrometrijsko ispitivanje stabilnosti površine staklastog karbona oksidovanog ugljen-dioksidom ili kiseonikom
EP  - 768
IS  - 11
SP  - 761
VL  - 67
UR  - https://hdl.handle.net/21.15107/rcub_technorep_428
ER  - 

@article{
author = "Perić-Grujić, Aleksandra and Nešković, Olivera M. and Veljković, Miomir V. and Laušević, Mila and Laušević, Zoran",
year = "2002",
abstract = "The temperature-programmed desorption (TPD) method combined with mass spectrometric (MS) analysis has been applied to investigate the surface properties of carbon materials. The apparatus consisting of a temperature-programmed furnace and a quadrupole mass spectrometer was constructed in order to characterize the surface of differently treated glassy carbon samples. In this work, samples of glassy carbon exposed to air, CO2 and O2 were examined. The desorption of H2O,CO and CO2, as major products, indicated the presence of different oxide groups. The amount of these groups for all samples was calculated. It is concluded that oxidation affects the nature and the amount of the surface oxide groups and contributes to their increased stability., Za ispitivanja površinskih karakteristika ugljeničnih materijala, konstruisan je uređaj za temperaturski programiranu desorpciju sa masenospektrometrijskim detektorom pomoću koga se prate desorpcioni produkti razlaganja površinskih oksidnih kompleksa. Pri tome je moguće vršiti njihovu kvalitativnu i kvantitativnu analizu. U okviru ovog rada ispitan je uticaj oksidacije ugljen-dioksidom, odnosno kiseonikom, na površinske osobine staklastog karbona, jer je on sintetički ugljenični materijal čija primena u velikoj meri zavisi od njegovih površinskih osobina. Desorpcija vode ugljen-monoksida i ugljen-dioksida, kao glavnih desorpcionih produkata ukazala je na prisustvo različitih količina, različitih oksidnih grupa na površini ispitanih uzoraka. Rezultati su pokazali da oksidacija ugljen-dioksidom, odnosno kiseonikom dovodi do smanjenja broja oksidnih grupa koje se razlažu na temperaturama ispod 1000 K, kao i do formiranja stabilnijih grupa koje se razlažu na višim temperaturama.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "TPD-MS study of glassy carbon surfaces oxidized by CO2 and O2, Maseno spektrometrijsko ispitivanje stabilnosti površine staklastog karbona oksidovanog ugljen-dioksidom ili kiseonikom",
pages = "768-761",
number = "11",
volume = "67",
url = "https://hdl.handle.net/21.15107/rcub_technorep_428"
}

Perić-Grujić, A., Nešković, O. M., Veljković, M. V., Laušević, M.,& Laušević, Z.. (2002). TPD-MS study of glassy carbon surfaces oxidized by CO2 and O2. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 67(11), 761-768.
https://hdl.handle.net/21.15107/rcub_technorep_428

Perić-Grujić A, Nešković OM, Veljković MV, Laušević M, Laušević Z. TPD-MS study of glassy carbon surfaces oxidized by CO2 and O2. in Journal of the Serbian Chemical Society. 2002;67(11):761-768.
https://hdl.handle.net/21.15107/rcub_technorep_428 .

Perić-Grujić, Aleksandra, Nešković, Olivera M., Veljković, Miomir V., Laušević, Mila, Laušević, Zoran, "TPD-MS study of glassy carbon surfaces oxidized by CO2 and O2" in Journal of the Serbian Chemical Society, 67, no. 11 (2002):761-768,
https://hdl.handle.net/21.15107/rcub_technorep_428 .

TY  - JOUR
AU  - Đurkić, Tatjana
AU  - Perić, Aleksandra
AU  - Laušević, Mila
AU  - Dekanski, Aleksandar
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Laušević, Zoran
PY  - 1997
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/153
AB  - The effects of boron and phosphorus incorporation in phenolic resin precursor on the surface properties of glassy carbon (GC) have been studied. Characterization of the surface properties using X-ray photoelectron spectroscopy and mass spectrometry analysis of desorption products showed that boron and phosphorus doped GC contained more carbon-oxygen complexes on the surface than undoped GC. The thermal decomposition of the surface oxide species, resulting in desorption of CO and CO2 as major gas products, showed that the presence of heteroatoms affects the nature of the surface oxide species and contributes to their increased stability. The presence of stable surface oxide species promotes the increased oxidation resistance of doped GC samples.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Carbon
T1  - Boron and phosphorus doped glassy carbon: I. Surface properties
EP  - 1572
IS  - 10-11
SP  - 1567
VL  - 35
DO  - 10.1016/S0008-6223(97)00113-9
ER  - 

@article{
author = "Đurkić, Tatjana and Perić, Aleksandra and Laušević, Mila and Dekanski, Aleksandar and Nešković, Olivera M. and Veljković, Miomir V. and Laušević, Zoran",
year = "1997",
abstract = "The effects of boron and phosphorus incorporation in phenolic resin precursor on the surface properties of glassy carbon (GC) have been studied. Characterization of the surface properties using X-ray photoelectron spectroscopy and mass spectrometry analysis of desorption products showed that boron and phosphorus doped GC contained more carbon-oxygen complexes on the surface than undoped GC. The thermal decomposition of the surface oxide species, resulting in desorption of CO and CO2 as major gas products, showed that the presence of heteroatoms affects the nature of the surface oxide species and contributes to their increased stability. The presence of stable surface oxide species promotes the increased oxidation resistance of doped GC samples.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Carbon",
title = "Boron and phosphorus doped glassy carbon: I. Surface properties",
pages = "1572-1567",
number = "10-11",
volume = "35",
doi = "10.1016/S0008-6223(97)00113-9"
}

Đurkić, T., Perić, A., Laušević, M., Dekanski, A., Nešković, O. M., Veljković, M. V.,& Laušević, Z.. (1997). Boron and phosphorus doped glassy carbon: I. Surface properties. in Carbon
Pergamon-Elsevier Science Ltd, Oxford., 35(10-11), 1567-1572.
https://doi.org/10.1016/S0008-6223(97)00113-9

Đurkić T, Perić A, Laušević M, Dekanski A, Nešković OM, Veljković MV, Laušević Z. Boron and phosphorus doped glassy carbon: I. Surface properties. in Carbon. 1997;35(10-11):1567-1572.
doi:10.1016/S0008-6223(97)00113-9 .

Đurkić, Tatjana, Perić, Aleksandra, Laušević, Mila, Dekanski, Aleksandar, Nešković, Olivera M., Veljković, Miomir V., Laušević, Zoran, "Boron and phosphorus doped glassy carbon: I. Surface properties" in Carbon, 35, no. 10-11 (1997):1567-1572,
https://doi.org/10.1016/S0008-6223(97)00113-9 . .

TY  - JOUR
AU  - Perić, Aleksandra
AU  - Nešković, Olivera M.
AU  - Veljković, Miomir V.
AU  - Miletić, Marjan
AU  - Zmbov, K
AU  - Petrović, S.
AU  - Laušević, Mila
AU  - Laušević, Zoran
PY  - 1996
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/91
AB  - The temperature-programmed desorption (TPD) method combined with mass spectrometric analysis has been applied to the characterization of glassy carbon (GC) and modified glassy carbon surfaces. Five different samples of GC were obtained from a commercial resol type of phenol formaldehyde resin that bad undergone several treatments: the samples were either pure GC, GC treated with boron and phosphorus, or GC modified by metal (silver and palladium). Mass spectrometric analysis has shown that the thermal decomposition of surface oxide species results in desorption of H2O, CO and CO2, these being the major gas products. On the basis of the TPD spectra obtained, desorption energies have been calculated using a peak position method. The influence of CO2 oxidation on the surface properties of the samples was also investigated. It was concluded that metal deposition on a glassy carbon surface contributes to increased stability of surface oxide species, the most stable surface being one that has been modified by palladium deposition.
PB  - Wiley, Hoboken
T2  - Rapid Communications in Mass Spectrometry
T1  - Temperature-programmed desorption mass spectrometric study of the surface properties of glassy carbon
EP  - 1236
IS  - 10
SP  - 1233
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_vinar_2004
ER  - 

@article{
author = "Perić, Aleksandra and Nešković, Olivera M. and Veljković, Miomir V. and Miletić, Marjan and Zmbov, K and Petrović, S. and Laušević, Mila and Laušević, Zoran",
year = "1996",
abstract = "The temperature-programmed desorption (TPD) method combined with mass spectrometric analysis has been applied to the characterization of glassy carbon (GC) and modified glassy carbon surfaces. Five different samples of GC were obtained from a commercial resol type of phenol formaldehyde resin that bad undergone several treatments: the samples were either pure GC, GC treated with boron and phosphorus, or GC modified by metal (silver and palladium). Mass spectrometric analysis has shown that the thermal decomposition of surface oxide species results in desorption of H2O, CO and CO2, these being the major gas products. On the basis of the TPD spectra obtained, desorption energies have been calculated using a peak position method. The influence of CO2 oxidation on the surface properties of the samples was also investigated. It was concluded that metal deposition on a glassy carbon surface contributes to increased stability of surface oxide species, the most stable surface being one that has been modified by palladium deposition.",
publisher = "Wiley, Hoboken",
journal = "Rapid Communications in Mass Spectrometry",
title = "Temperature-programmed desorption mass spectrometric study of the surface properties of glassy carbon",
pages = "1236-1233",
number = "10",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_vinar_2004"
}

Perić, A., Nešković, O. M., Veljković, M. V., Miletić, M., Zmbov, K., Petrović, S., Laušević, M.,& Laušević, Z.. (1996). Temperature-programmed desorption mass spectrometric study of the surface properties of glassy carbon. in Rapid Communications in Mass Spectrometry
Wiley, Hoboken., 10(10), 1233-1236.
https://hdl.handle.net/21.15107/rcub_vinar_2004

Perić A, Nešković OM, Veljković MV, Miletić M, Zmbov K, Petrović S, Laušević M, Laušević Z. Temperature-programmed desorption mass spectrometric study of the surface properties of glassy carbon. in Rapid Communications in Mass Spectrometry. 1996;10(10):1233-1236.
https://hdl.handle.net/21.15107/rcub_vinar_2004 .

Perić, Aleksandra, Nešković, Olivera M., Veljković, Miomir V., Miletić, Marjan, Zmbov, K, Petrović, S., Laušević, Mila, Laušević, Zoran, "Temperature-programmed desorption mass spectrometric study of the surface properties of glassy carbon" in Rapid Communications in Mass Spectrometry, 10, no. 10 (1996):1233-1236,
https://hdl.handle.net/21.15107/rcub_vinar_2004 .