Abstract
We present an experimental and theoretical study of the 3d core level spectra along the pnicitides YbN, YbP and YbAs and determine the degree of valence mixing as a function of anion electronegativity. The experimental spectra are obtained using SiKα radiation (hν = 1740 eV). They show on the low binding energy side of the dominating 3d9 4f13 multiplets a weak 3d9 4f14 doublet. The theoretical lineshapes and satellite structures are obtained from a combination of many body techniques due to Gunnarsson and Schoenhammer [1] and standard atomic calculations in intermediate coupling.
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