A development of site-selective, valence-selective, and spin-selective XAFS spectroscopy by inelastic x-ray scattering

点击翻译按钮获取中文摘要

Thanks to the present grant, we have constructed a high-sensitive x-ray spectrometer, developed a method to obtain lifetime-broadening-free XANES spectra, and carried out the following spectroscopic studies.1. Construction of an x-ray spectrometer equipped with a two-dimensional detector and five dispersing analyzer crystal.2. We have succeeded in obtaining weak XANES spectra excited under pre-resonantt conditions owing to the high-sensitive spectrometer described above. Subsequently, we have shown that lifetime-broadening-free XANES spectra can be obtained by numerically analyzing those spectra by an equation based on Kramers-Heisenberg equation.3. Based on 1 and 2, we have carried out the following studies.(1) Observation of spin-selective XANES spectra of MnO and other manganese compounds.(2) Studies on orbital- and spin-ordering of LaMnO3 by spin-selective, polarization XANES spectra.(3) Observation of 2p-4f quadrupole transitions of Dy and Ho compounds.(4) Valence-selective XANES study of mixed valence (Ge^<3+>(Ge^+Cl^-_4)) compound GeCl_2.