Jv. Rau et al., Mass spectrometric determination of appearance energies for ions formed from CoF4 and CoF3 molecules, RAP C MASS, 14(6), 2000, pp. 459-463
Knudsen cell mass spectrometry was applied to the evaluation of the ionizat
ion efficiency curves for the ions originating from CoF4 molecules. Cobalt
tetrafluoride was obtained in the gas phase over the CoF3(s)-TbF4(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 CoF4 molecules
were determined by means of Vogt's deconvolution method. Clausius-Clapeyron
plots for the ions from CoF4 molecules were measured. Evaporation of pure
CoF3(s) was carried out, and the appearance energies of the ions formed fro
m CoF3 molecules were determined. The ionization energies for CoF4 and CoF3
molecules were found to be (14.3 +/- 0.2) and (13.3 +/- 0.1) eV, respectiv
ely. Copyright (C) 2000 John Whey & Sons, Ltd.