Sulfur <i>K</i>β X-Ray Emission Bands and Valence-Band Structures of Transition-Metal Disulfides

Abstract

The sulfur K β emission spectra in fluorescence from FeS 2 , CoS 2 , NiS 2 (with pyrite structure) and 2H-MoS 2 (with layered structure) have been measured on a vacuum two-crystal spectrometer. Results are evaluated by comparing the sulfur K β emission spectra with the X-ray photoelectron spectra of the valence-band region for the transition-metal disulfides, with the sulfur L II, III emission spectra and with the recent electronic-structure calculations. A reasonable agreement is obtained between them. It is indicated that the sulfur 3 p -like valence bands of the metal disulfides are very broad and their upper parts overlap with the 3 d - or 4 d -like band of the metals.