Mass spectrometric determination of appearance energies for ions formed from CoF4 and CoF3 molecules

✍ Scribed by J. V. Rau; L. Bencze; A. Popović; N. S. Chilingarov; L. N. Sidorov

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 91 KB
• Volume: 14
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(20000331)14:6<459::aid-rcm893>3.0.co;2-e

✦ Synopsis

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 AE 0.2) and (13.3 AE 0.1) eV, respectively.