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The X-ray emission spectra and electronic structure of the misfit layer compounds (BiS)1.08NbS2 and (PbS)1.14TaS2

The X-ray emission lines S K beta (3p to 1s) and S L2,3 (3s to 2p) have been measured for the misfit layer compounds (BiS)1.08NbS2 and (PbS)1.14TaS2 and the corresponding binary sulphides Bi2S3, NbS2, PbS and TaS2. The X-ray emission data are compared with X-ray photoelectron spectra and band structure calculations of isolated model layers. The experimental data show very clearly the character of the different valence band states, and partial density of states schemes are easily deduced from these data. A comparison with band structure calculations shows a good agreement with the measured spectra.