Electron Impact Investigation of the Molecules SeS(g) and TeSe(g) Under High‐Temperature Equilibrium Conditions

Abstract

Abstract SeS(g) and TeSe(g) molecules, produced by Knudsen‐cell vaporization of the mixed HB/VIA‐systems ZnS/ZnSe and CdSe/CdTe, were studied by energy‐dispersive electron impact ionization. Analysis of ionization efficiency curves yields energy levels of excited ionic states of the molecule ions SeS + (g) and TeSe + (g). The energy levels correlate with corresponding states of S (g), Se (g) and Te (g) derived from independent photoelectron‐spectroscopic data. ‐ Thermodynamic analysis of the intensity data yields dissociation energies of the neutral and singly ionized species, standard enthalpies of formation, heats and equilibrium constants of the gas‐phase reaction \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm XY}({\rm g}) = \frac{1}{2}{\rm X}_2 ({\rm g}) + \frac{1}{2}{\rm Y}_2 ({\rm g})\,({\rm X} = {\rm Se and Y} = {\rm S},{\rm Te} $\end{document} as well as total and partial pressures for the ZnS/ZnSe‐system.