Abstract
Single CdPS3 crystals have been investigated at room temperature by means of x-ray photoemission spectroscopy (XPS) and x-ray induced Auger spectroscopy. Special attention has been paid to the Cd 3d and 4d and S and P 2p core levels and to the Cd Auger M4,5N4,5N4,5 transitions. As far as the XPS spectra are concerned, a single-peak structure has been observed for all the core levels investigated. Moreover, the Cd 4d levels are discrete and well localized, in good agreement with the transition–metal weakly interacting model according to which the transition metal–sulfur bond is weak. Further information about the nature of the cadmium–sulfur bond in CdPS3 was obtained from the calculated modified Auger parameter for Cd. A correlation has been observed between the change in the Cd modified Auger parameter in CdPS3 and the energy gap of this compound.
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