The relative importance of vibrational and ligand field splittings on core d-level photoelectron and NVV Auger spectra: high resolution core level photoelectron spectrum of the I 4d level of HI

A high resolution I 4d photoelectron spectrum (total instrumental resolution (60 meV) of HI is reported. The resolved splitting of the 4d9 final state is shown to be due to ligand field and not vibrational splitting. Previously reported I 4d photoelectron and NVV Auger spectra of HI (Karlsson et al) are reinterpreted based on the ligand field splitting of the I 4d core level. The presence of valence electron relaxation in hydrogen halides is shown to be an important influence on the magnitude of core level ligand field splitting and inherent linewidth.

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