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Mass spectrometric determination of appearance energies for ions formed from CoF 4 and CoF 3 molecules
Author(s) -
Rau J. V.,
Bencze L.,
Popović A.,
Chilingarov N. S.,
Sidorov L. N.
Publication year - 2000
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(20000331)14:6<459::aid-rcm893>3.0.co;2-e
Subject(s) - chemistry , molecule , ion , ionization , mass spectrometry , analytical chemistry (journal) , electron ionization , ionization energy , chemical ionization , evaporation , chromatography , organic chemistry , physics , thermodynamics
Knudsen cell mass spectrometry was applied to the evaluation of the ionization efficiency curves for the ions originating from CoF 4 molecules. Cobalt tetrafluoride was obtained in the gas phase over the CoF 3 (s)–TbF 4 (s) system in the temperature range from 640 to 690 K. From the ionization efficiency curves the appearance energies of the ions formed from the CoF 4 molecules were determined by means of Vogt's deconvolution method. Clausius‐Clapeyron plots for the ions from CoF 4 molecules were measured. Evaporation of pure CoF 3 (s) was carried out, and the appearance energies of the ions formed from CoF 3 molecules were determined. The ionization energies for CoF 4 and CoF 3 molecules were found to be (14.3 ± 0.2) and (13.3 ± 0.1) eV, respectively. Copyright © 2000 John Wiley & Sons, Ltd.