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.

*This research is supported through the Stanford PULSE Institute, SLAC National Accelerator Laboratory by the U.S. Department of Energy, Office of Basic Energy Sciences, Atomic, Molecular, and Optical Science Program. Use of the LINAC Coherent Light Source (LCLS), SLAC National Accelerator Laboratory is supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.

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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