Exchange splitting of photoemission lines in GdF3 and metallic Gd compounds

X-ray photoelectron spectroscopy was used to study the electronic structure of bulk GdF3, Gd2In acid Gd5Si4 The structure of the Gd photoemission core level multiplets was analysed and compared to that one obtained for Gd met al. The line-width and the intensity ratio of the component lines within th e multiplets were found to be dependent on the compound. The observed effec ts have been related to the variation of the valence band structure and var ious hybrydization effects between the 4f electrons and conduction or valen ce ones. The most modified multiplet structure in relation to Gd metal was found in the ionic compound GdF3.