ESCA studies of some copper and silver selenides |
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Authors: | M Romand M Roubin JP Deloume |
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Institution: | Laboratoire de Chimie Applique´e et Ge´nie Chimique (C.N.R.S. ERA no. 300), Universite´Claude Bernard — Lyon I, 69621, Villeurbanne France;Laboratoire de Chimie Mine´rale III, Universite´Claude Bernard - Lyon I, 69621 Villeurbanne France |
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Abstract: | Photoelectron and Auger spectra have been obtained for the copper and silver selenides CuSe, Cu 2Se, Ag 2Se, and AgCuSe as well as from CuS, Ag 2O, Ag 2S, Cu, and Ag. Binding-energy values, chemical shifts, and peak-shapes are reported for the Cu 3 d, Ag 4 d and Se 3 p electrons. Absence of multiplet splitting and shake-up structure is discussed in relation to the magnetic properties. It is shown that chemical shifts are much better revealed in the Auger spectra (Cu L3M4,5M4, 5 and Ag M5N4, 5N4, 5) than in the direct photoelectron ones. In addition the use of the Auger parameter to characterize the series under study is emphasized. Finally the valence-band spectra have been examined and the electronic structures are interpreted. |
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