Evaporative corrections to high-pressure ionic clustering data

Measurements of ionic clustering equilibria in a high-pressure mass spectrometer source are subject to a systematic error arising from in-flight evaporation. Recent advances in unimolecular rate theory permit a general analysis of this problem. The information necessary for its solution is extracted...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 100
Main Author Klots, C.E.
Format Journal Article
LanguageEnglish
Published United States 31.10.1990
Subjects
400201 - Chemical & Physicochemical Properties
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
EQUILIBRIUM
EVAPORATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IONS
KINETICS
MASS SPECTROSCOPY
MATHEMATICAL MODELS
MOLECULES
PHASE TRANSFORMATIONS
REACTION KINETICS
SPECTROSCOPY
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Summary:Measurements of ionic clustering equilibria in a high-pressure mass spectrometer source are subject to a systematic error arising from in-flight evaporation. Recent advances in unimolecular rate theory permit a general analysis of this problem. The information necessary for its solution is extracted from evaporation measurements made in other contexts. The authors consolidate this information in a 'best value' for the Gspann parameter which they report as {gamma} = 23.5 ({plus minus}1.5). They then find that in typical experimental conditions evaporation is indeed important. Nevertheless, in measurements of an equilibrium constant offsetting errors will ameliorate the severity of this artifact.
ISSN:0022-4596
1095-726X
DOI:10.1016/0168-1176(90)85088-J