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Ultrafast Electron Diffraction Reveals Dark Structures of the Biological Chromophore Indole

Authors

  • Sang Tae Park Dr.,

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (USA), Fax: (+1) 626-796-8315
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  • Andreas Gahlmann,

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (USA), Fax: (+1) 626-796-8315
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  • Yonggang He Dr.,

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (USA), Fax: (+1) 626-796-8315
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  • Jonathan S. Feenstra Dr.,

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (USA), Fax: (+1) 626-796-8315
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  • Ahmed H. Zewail Prof.

    1. Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (USA), Fax: (+1) 626-796-8315
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  • This work was supported by the National Science Foundation and the Air Force Office of Scientific Research in the Gordon and Betty Moore Center of Physical Biology at Caltech. We would like to thank Prof. Kenneth W. Hedberg for help in designing the air-heated inlet system. We would also like to thank Prof. Andrzej L. Sobolewski for providing the starting geometries of the relevant species for our data analysis.

Abstract

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Shedding a light on the dark: Ultrafast electron diffraction of the tryptophan chromophore, indole (see determined structure; C orange, N blue, H white), reveals the involvement of dark structures in the nonradiative pathways of the isolated molecule. Such dark structures have to be part of the understanding of biological chromophore stability.

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