PES of high-temperature vapors. IV. The cesium halides. Effect of spin-orbit interaction on the photoelectron and mass spectra of the alkali halides

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Abstract
The He(I) photoelectron spectra of the cesium halides are presented. They exhibit two well‐separated sets of peaks, one deriving from orbitals formed from halogen p ‐type orbitals and the other from the cesium p orbitals. Each set of bands is analyzed by taking into account spin‐orbit interaction within the degenerate ∏ states and subsequently between the ∏(1/2) and ∑(1/2) states. This analysis is a prototype for all alkali halides and has been used in conjunction with ab initio calculations to construct potential energy curves for LiCl, LiBr, LiI, and KF. These cases suffice to characterize the variations in the photoelectron spectra and mass spectra for all the alkali halides.