Contributions of s- and d-final states to the M 2, 3 extended energy loss fine structure in copper

Abstract

Extended energy loss fine structures have been detected in the reflection mode above the M 2, 3 edge of a copper (1 1 0) single crystal. The radial distribution function (RDF) obtained by performing the Fourier transform of the EELFS signal shows a dependence of the nearest-neighbour distance peak on the integration range of the wave vector k. For k between 2.9 Å -1 and 9 Å -1 the RDF peaks at r= 2.12 ± 0.02 A ̊ as reported by other groups. However, by integrating over a wider range of wave vectors between 2.9 Å -1 and 12 Å -1 we have obtained a peak at r = 2.21 ± 0.02 A ̊ . This can be explained as arising from significant contributions from both the d- and s-symmetric final states.