M4,5N4,5N4,5 auger electron spectrum of Ba metal

Abstract

The Al Kα excited M 4,5 N 4,5 N 4,5 Auger spectrum of Ba has been measured from the metallic sample evaporated on a Ag substrate. The spectrum has been decomposed into individual line components after the background subtraction. The decomposed spectrum has been compared with the theoretical spectrum calculated for the 4 d −2 final state configuration in the mixed coupling scheme applying jj-coupling for the initial state and intermediate coupling for the final state. The most prominent structure of the spectrum shows the two 4 d-hole coupling, but the structure which is caused by the Auger transitions M ,45 N 2,3 V has also been observed. The screening of the core holes in Ba metal seems to be produced by (5 d6 s) electrons. The simple excited atom model HF-calculations give an Auger kinetic energy shift (metal-free atom) of 16.7 eV, which is comparable to the experimental value 14–18 eV.