Probe for Spin- and Valence-Selective X-ray Absorption Fine Structure Spectroscopy: EuL[gamma]4 Emission

EuL... emission spectra of EuS, EuF..., EuCl..., and ... were measured using a multicrystal, multidetector spectrometer. Splitting of the EuL... band was observed in the EuS spectra and attributed to exchange interactions between Eu5p and Eu4f. It was shown that because of this splitting, the EuL... emission could be used for performing spin-selective measurements. This emission exhibited a large chemical shift (~5 eV), depending on the valence state of a compound. The applicability of this emission to valence-selective X-ray absorption fine structure spectroscopy was demonstrated through partial fluorescence yield measurements performed on a 1:1 mixture of EuS and ... and on a valence-fluctuating compound ... (ProQuest: ... denotes formulae/symbols omitted.)