He(II) Photoelectron spectra of indium(I) and thallium(I) halides

Abstract

Vapour phase He (II) photoelectron spectra of the thallium (I) and indium (I) halides MX (X = Cl, Br, I) are reported and compared with He (I) data. The additional structure in He (II) spectra is due largely to ionization of “inner”d electrons; the detail can be understood in terms of a weak-field perturbation of ²D_5/2 and ²D final states associated with a d⁹ configuration at the metal ion. However, the spectrum of TICI contains certain extra features which probably represent many-electron (or shake-up) processes.