Tails of near-edges x-ray absorption spectra as a fingerprint of magnetic and structural phase transitions. Application to metallic 3d ultra thin films
Tails of x-ray absorption near-edge structure (XANES)/x-ray magnetic circular dichroism spectroscopy (XMCD) spectra (50–100 eV above the edges) are characterized by the beginning of the extended x-ray absorption fine-structure/magnetic extended x-ray absorption fine-structure oscillations. We present a systematic study of these tails for three different thin films: Fe and Fe0.65Ni0.35 on stepped Cu(111) and Fe/ZnSe(001). The dependance of the detected oscillations on the film thickness leads us to conclude that XANES/XMCD tails are a useful in situ probe of the structural and magnetic phase of the sample.
Abstract A selective method for the detection of osmium by flame atomic emission spectrometry is described. The method is based on extracting osmium tetroxide into MIBK, at pH 2.1–9.5, and aspirating the extract into a nitrous oxide-acetylene flame. By this procedure the effect of common interferences in atomic emission spectrometric determination of osmium has been eliminated or minimized.