Probing Ultrafast Dissociation Dynamics of Pentafluorobenzene Cation (C<sub>6</sub>F<sub>5</sub>H<sup>+</sup>) with Electrons

ORAL

Abstract

Real-time observation of a structural change of photoexcited molecular ion is important to understand the fundamental reaction mechanism. Here, we use mega-electronvolt ultrafast electron diffraction technique (MeV-UED) to directly construct a molecular movie of photogenerated pentafluorobenznen cation. The molecular cation was produced by multiphoton ionization of C6F5H at 269 nm. This cation dissociates into fragment ions within ~10 ps time scale through statistical internal energy redistribution prior to the following bond dissociaiton and ring opening. Parir distribution function (PDF) analysis allows us to pin down the specific chemical bond dissociaiton process in this unimolecular dynamics.

*The UED work was performed at SLAC MeV- UED, which is supported in part by the DOE BES SUF Division Accelerator & Detector R&D program, the LCLS Facility, and SLAC under contract Nos. DE-AC02-05-CH11231 and DE-AC02-76SF00515.

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Presenters

  • Ming-Fu Lin

    • SLAC
    • SLAC National Accelerator Laboratory

Authors

  • Ming-Fu Lin

    • SLAC
    • SLAC National Accelerator Laboratory

  • Xiaozhe Shen

    • SLAC National Accelerator Laboratory

  • Pedro Nunes

    • Department of Physics and Astronomy, UNIVERSITY OF NEBRASKA–LINCOLN

  • Jie Yang

    • SLAC National Accelerator Laboratory

  • Renkai Li

    • SLAC National Accelerator Laboratory

  • Stephen Weathersby

    • SLAC National Accelerator Laboratory

  • Rob Parrish

    • Department of Chemistry, Stanford University

  • Todd Martinez

    • Department of Chemistry, Stanford University

  • Martin Centurion

    • Department of Physics and Astronomy, UNIVERSITY OF NEBRASKA–LINCOLN

  • Thomas Jacob Arcangelo Wolf

    • SLAC National Accelerator Laboratory

  • Xijie Wang

    • SLAC National Accelerator Laboratory
    • SLAC

  • Michael Minitti

    • SLAC National Accelerator Laboratory