Following population transfer in a pump-dump experiment using time-resolved x-ray scattering

ORAL

Abstract

Molecular iodine was photoexcited using a combination of 520 and 800 nm light at variable delay. The 520 nm ‘pump’ pulse photoexcites iodine onto the bound B state, and the 800 nm ‘dump’ pulse can couple the excited population back to the X state when the resonance condition is satisfied. The ‘dump’ population was observed at the LINAC Coherent Light Source (LCLS) using time-resolved x-ray scattering (TRXS) or, rather, the temporal Fourier transform of TRXS, called frequency-resolved x-ray scattering (FRXS). The FRXS identifies a dump population with a beat frequency of $31.8\pm0.9$~THz oscillating about an equilibrium position of $3.2\pm0.1$~\AA, which match the expected values. The dump population varies with a period of $330\pm20$~fs, half of the B state vibrational period.

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Authors

  • Matthew Ware

    Department of Physics at Stanford University, PULSE Institute, PULSE Institute, Stanford University

  • J. Michael Glownia

    LINAC Coherent Light Source, SLAC National Laboratory, Linac Coherent Light Source - SLAC National Accelerator Laboratory, LCLS, SLAC National Accelerator Laboratory

  • Noor Al-Sayyad

    Department of Physics at Stanford University, PULSE Institute, PULSE Institute, Stanford University

  • Philip Bucksbaum

    Department of Physics, Applied Physics, and Photon Science at Stanford University, PULSE Institute, PULSE Institute, Stanford Universitiy/SLAC