Oxidation state sensitivity of Eu Lγ4 emission and its applications to oxidation state selective EXAFS spectroscopy of EuPd2Si2

What is it about?

We have examined analytical spectrometry using Eu Lγ4. The oxidation-state-fluctuating compound EuPd2Si2 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. 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. In this manner, we have addressed and resolved two key questions in analytical spectrometry using Eu Lγ4.

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Why is it important?

The chemical effects of Eu Lγ4 effectively depend solely on the oxidation state of the Eu ions, and the oxidation state selective EXAFS can be practically obtained by the PFY detection of Eu Lγ4. These findings are important in material science.