LINEAR-X-RAY DICHROISM OF CADMIUM-SULFIDE WITH WURTZITE AND ZINCBLENDE STRUCTURES

A comparison is made between x-ray absorption spectra at the sulphur K edge for CdS in wurtzite and zincblende structures. Differences betwe en the polarization dependences of the x-ray spectra are expected due to the differences in symmetry for the two modifications. Multiple-sca ttering calculations in both structures are compared to published spec tra and allow us to interpret a strong dichroic effect in the wurtzite structure. The intensity of a specific resonance is related to the mi ddle-range order around sulphur atoms and potential applications of th is fingerprint analysis are proposed.