title: Probe for spin- and valence-selective X-ray absorption fine structure spectroscopy: EuLgamma4 emission.
abstract: EuLgamma(4) emission spectra of EuS, EuF(3), EuCl(3), and Eu(2)O(3) were measured using a multicrystal, multidetector spectrometer. Splitting of the EuLgamma(4) 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 EuLgamma(4) emission could be used for performing spin-selective measurements. This emission exhibited a large chemical shift (approximately 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 Eu(2)O(3) and on a valence-fluctuating compound Eu(3)Pd(20)Ge(6).
authors.affiliation: Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo, Tokyo 112-8681, Japan. hayashih@fc.jwu.ac.jp
authors.forename: Hisashi
authors.initials: H
authors.lastname: Hayashi
authors.forename: Naomi
authors.initials: N
authors.lastname: Kawamura
authors.forename: Masaichiro
authors.initials: M
authors.lastname: Mizumaki
authors.forename: Toshiro
authors.initials: T
authors.lastname: Takabatake