Oxidation state sensitivity of Eu Lγ4 emission and its applications to oxidation state selective EXAFS spectroscopy of EuPd 2Si2

Hisashi Hayashi, Noriko Kanai, Yuki Takehara, Naomi Kawamura, Masaichiro Mizumaki, Akihiro Mitsuda

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Abstract

In this paper, we have examined analytical spectrometry using Eu Lγ4. The oxidation-state-fluctuating compound EuPd 2Si2 exhibits the largest temperature-induced valence changes among all Eu systems and does not have a structural phase transition below 298 K; EuPd2Si2 has a precipitous valence transition near 150 K. Hence, high-resolution Eu Lγ4 emission spectra of EuPd2Si2 at 298 K and 30 K were measured using a multicrystal multidetector spectrometer. The spectra exhibited substantial differences, thereby indicating that the spectral shapes of Eu Lγ4 emissions depend on the oxidation state of the Eu ions. We have also demonstrated the applicability of Eu Lγ4 emission to oxidation state selective extended X-ray absorption fine structure (EXAFS) spectroscopy through partial fluorescence yield measurements with an excitation energy range of approximately 0.5 keV. In this manner, we have addressed and resolved two key questions in analytical spectrometry using Eu Lγ4.

Original languageEnglish
Pages (from-to)1858-1862
Number of pages5
JournalJournal of Analytical Atomic Spectrometry
Volume26
Issue number9
DOIs
Publication statusPublished - Sep 1 2011

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Spectroscopy

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