Polymeric Gaseous Molecules in the Vaporization of Alkali Halides

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Abstract
The molecular species of alkali halide vapors in equilibrium with their respective condensed phases have been deduced by a mass spectrometric analysis of the ions produced by electron impact. Dimers, trimers, and in some instances tetramers MnXn were observed, with the lithium halides exhibiting more dimeric than monomeric species. The results are in substantial agreement with earlier molecular beam velocity selector experiments, and discordant with some recent infrared spectral studies. Some oddities in the ionization efficiency curves are also discussed.

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