Mass spectrometric study of ions formed from cesium metaborate vapor under electron impact.

概要

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An ionization behavior of cesium metaborate vapor under electron impact has been studied by a mass spectrometric method. Formations of Cs2+, CsB+, CsO+, Cs2+, Cs2O+, B+ and BO2- ions have been identified in addition to the well known ions of Cs+, CsBO+, CsBO2+ and Cs2BO2+. Ionization processes and vapor precursors for these ions have been given from ionization efficiency curves, appearance energies, temperature dependence of ion intensities and energetics of the ionization processes as follows: the process for the formations of Cs+ with AE(Cs+)=3.9±1.0 eV and BO2- ions is the ion pair formation from CsBO2(g), that for CsBO2+ ion is the simple ionization of CsBO2(g), that for Cs+ with AE(Cs+)=9.1±0.5 eV, Cs2+, CsBO+, CsB+, CsO+ and B+ ions is the dissociative ionization from CsBO2(g) and that for Cs2+, Cs2O+ and Cs2BO2+ ions is the dissociative ionization from Cs2(BO2)2(g). The know-ledge of the ionization behavior of cesium metaborate vapor under electron impact is very useful in the mass spectrometric study of vaporization behaviors of CsBO2(s) and simulated radioactive waste borosilicate glasses.
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