Development of light-modulated XAFS spectroscopy

Kaoru Okamoto; Kenji Kohdate; Kensuke Nagai; Jun Miyawaki; Hiroshi Kondoh; Toshihiko Yokoyama; Akihiro Nojima; Toshiaki Ohta

doi:10.1107/S0909049503004321

Development of light-modulated XAFS spectroscopy

Kaoru Okamoto, Kenji Kohdate, Kensuke Nagai, Jun Miyawaki, Hiroshi Kondoh, Toshihiko Yokoyama, Akihiro Nojima, Toshiaki Ohta

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The light-modulation method was applied to XAFS spectroscopy as a useful tool for electronic and structural studies of light-excited states. The visible light for electronic excitation was modulated by an optical chopper and the concomitant change in the X-ray absorbance was extracted by a lock-in amplifier. It is essential to reduce any noise arising from several sources, especially those generated by the X-ray monochromator. Fe and Co K-edge XANES and EXAFS spectra were measured using the present approach for spin transition compounds. The light-modulated XAFS method is found to be applicable to systems with an excited-state ratio of less than several percent. Detailed discussion is also given concerning quantitative measurements, including the signal amplitude and phase shift information.

Original language	English
Pages (from-to)	242-247
Number of pages	6
Journal	Journal of Synchrotron Radiation
Volume	10
Issue number	3
DOIs	https://doi.org/10.1107/S0909049503004321
Publication status	Published - 2003 May 1
Externally published	Yes

Keywords

Light-induced excited-state spin transitions
Photomodulation method
Relaxation
Spin-crossover complex
XAFS

ASJC Scopus subject areas

Radiation
Nuclear and High Energy Physics
Instrumentation

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10.1107/S0909049503004321

Cite this

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keywords = "Light-induced excited-state spin transitions, Photomodulation method, Relaxation, Spin-crossover complex, XAFS",

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AU - Okamoto, Kaoru

AU - Kohdate, Kenji

AU - Nagai, Kensuke

AU - Miyawaki, Jun

AU - Kondoh, Hiroshi

AU - Yokoyama, Toshihiko

AU - Nojima, Akihiro

AU - Ohta, Toshiaki

PY - 2003/5/1

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KW - Light-induced excited-state spin transitions

KW - Photomodulation method

KW - Relaxation

KW - Spin-crossover complex

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Development of light-modulated XAFS spectroscopy

Abstract

Keywords

ASJC Scopus subject areas

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