Production and ionization energies of KnF (n=2-6) clusters by thermal ionization mass spectrometry
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2012
Authors
Veljković, Filip M.
Đustebek, Jasmina B.

Veljković, Miomir V.
Veličković, Suzana

Perić-Grujić, Aleksandra

Article (Published version)

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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.
Source:
Rapid Communications in Mass Spectrometry, 2012, 26, 16, 1761-1766Publisher:
- Wiley, Hoboken
Funding / projects:
- Effects of laser radiation and plasma on novel materials in their synthesis, modification, and analysis (RS-172019)
DOI: 10.1002/rcm.6284
ISSN: 0951-4198
PubMed: 22777777
WoS: 000306279800005
Scopus: 2-s2.0-84863674422
Institution/Community
Tehnološko-metalurški fakultetTY - 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 . .