Development of light-modulated XAFS spectroscopy

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 a...

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Bibliographic Details
Published in:Journal of synchrotron radiation 2003-05, Vol.10 (3), p.242-247
Main Authors: Okamoto, Kaoru, Kohdate, Kenji, Nagai, Kensuke, Miyawaki, Jun, Kondoh, Hiroshi, Yokoyama, Toshihiko, Nojima, Akihiro, Ohta, Toshiaki
Format: Article
Language:English
Subjects:
light-induced excited-state spin transitions
photomodulation method
relaxation
spin-crossover complex
XAFS
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Summary: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.
ISSN:1600-5775
0909-0495
1600-5775
DOI:10.1107/S0909049503004321