Taking snapshots of photoexcited molecules in disordered media by using pulsed synchrotron X-rays |
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Authors: | Chen Lin X |
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Institution: | Chemistry Division, Argonne National Laboratory, Building 200, 9700 South Cass Avenue, Argonne, IL 60439, USA. lchen@anl.gov |
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Abstract: | Photoexcited molecules are quintessential reactants in photochemistry. Structures of these photoexcited molecules in disordered media in which a majority of photochemical reactions take place remained elusive for decades owing to a lack of suitable X-ray sources, despite their importance in understanding fundamental aspects in photochemistry. As new pulsed X-ray sources become available, short-lived excited-state molecular structures in disordered media can now be captured by using laser-pulse pump, X-ray pulse-probe techniques of third-generation synchrotron sources with time resolutions of 30-100 ps, as demonstrated by examples in this review. These studies provide unprecedented information on structural origins of molecular properties in the excited states. By using other ultrafast X-ray facilities that will be completed in the near future, time-resolution for the excited-state structure measurements should reach the femtosecond time scales, which will make "molecular movies" of bond breaking or formation, and vibrational relaxation, a reality. |
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Keywords: | excited‐state structures laser spectroscopy synchrotron radiation X‐ray absorption spectroscopy |
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