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Published on: June 28, 2018
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Probe for spin- and valence-selective X-ray absorption fine structure spectroscopy: EuLgamma4 emission
Hisashi Hayashi1, Naomi Kawamura, Masaichiro Mizumaki
1Department 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
Analytical Chemistry
|January 28, 2009
Summary
Europium Lgamma(4) emission spectra reveal spin-selective measurement capabilities due to band splitting in EuS. This technique offers valence-selective X-ray absorption fine structure spectroscopy applications.
Area of Science:
- Atomic and Molecular Physics
- Solid State Chemistry
- Materials Science
Background:
- The electronic structure of europium compounds is complex, involving interactions between 5p and 4f electrons.
- Understanding these interactions is crucial for developing advanced spectroscopic techniques.
Purpose of the Study:
- To investigate the Eu Lgamma(4) emission spectra of various europium compounds.
- To explore the potential of Eu Lgamma(4) emission for spin-selective and valence-selective spectroscopy.
Main Methods:
- Measurements of Eu Lgamma(4) emission spectra using a multicrystal, multidetector spectrometer.
- Analysis of spectral splitting attributed to exchange interactions.
- Partial fluorescence yield measurements for X-ray absorption fine structure (XAFS) spectroscopy.
Main Results:
- Observed splitting of the Eu Lgamma(4) band in EuS, attributed to Eu5p-Eu4f exchange interactions.
- Demonstrated that Eu Lgamma(4) emission enables spin-selective measurements.
- Showcased a significant chemical shift (approx. 5 eV) dependent on europium's valence state.
- Validated the use of Eu Lgamma(4) emission in valence-selective XAFS spectroscopy on mixed and valence-fluctuating europium compounds.
Conclusions:
- Eu Lgamma(4) emission is a powerful tool for probing electronic structures in europium compounds.
- The observed spectral features facilitate spin- and valence-selective analyses.
- This emission provides a novel pathway for advanced XAFS studies on complex europium materials.
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