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 journalArticle

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 languageEnglish
Pages (from-to)242-247
Number of pages6
JournalJournal of Synchrotron Radiation
Volume10
Issue number3
DOIs
Publication statusPublished - 2003 May 1
Externally publishedYes

Fingerprint

X ray absorption fine structure spectroscopy
Excited states
spectroscopy
excitation
X rays
electric choppers
Monochromators
Light modulation
light modulation
monochromators
electronics
Phase shift
x rays
phase shift
amplifiers
shift

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Radiation

Cite this

Okamoto, K., Kohdate, K., Nagai, K., Miyawaki, J., Kondoh, H., Yokoyama, T., ... Ohta, T. (2003). Development of light-modulated XAFS spectroscopy. Journal of Synchrotron Radiation, 10(3), 242-247. https://doi.org/10.1107/S0909049503004321

Development of light-modulated XAFS spectroscopy. / Okamoto, Kaoru; Kohdate, Kenji; Nagai, Kensuke; Miyawaki, Jun; Kondoh, Hiroshi; Yokoyama, Toshihiko; Nojima, Akihiro; Ohta, Toshiaki.

In: Journal of Synchrotron Radiation, Vol. 10, No. 3, 01.05.2003, p. 242-247.

Research output: Contribution to journalArticle

Okamoto, K, Kohdate, K, Nagai, K, Miyawaki, J, Kondoh, H, Yokoyama, T, Nojima, A & Ohta, T 2003, 'Development of light-modulated XAFS spectroscopy', Journal of Synchrotron Radiation, vol. 10, no. 3, pp. 242-247. https://doi.org/10.1107/S0909049503004321
Okamoto K, Kohdate K, Nagai K, Miyawaki J, Kondoh H, Yokoyama T et al. Development of light-modulated XAFS spectroscopy. Journal of Synchrotron Radiation. 2003 May 1;10(3):242-247. https://doi.org/10.1107/S0909049503004321
Okamoto, Kaoru ; Kohdate, Kenji ; Nagai, Kensuke ; Miyawaki, Jun ; Kondoh, Hiroshi ; Yokoyama, Toshihiko ; Nojima, Akihiro ; Ohta, Toshiaki. / Development of light-modulated XAFS spectroscopy. In: Journal of Synchrotron Radiation. 2003 ; Vol. 10, No. 3. pp. 242-247.
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