Femtosecond Time-Resolved Coulomb Explosion Imaging of UV-Induced Photodissociation of Iodomethane

ORAL

Abstract

The UV-induced photodissociation of iodomethane (CH3I) and the ensuing molecular dynamics is investigated by time-resolved Coulomb explosion imaging. We utilize a UV-IR pump-probe setup with a coincident 3D ion momentum imaging apparatus to measure yields and kinetic energies of all ionic fragments as a function of the time-delay between the pump and probe pulses. Excitation at a wavelength of 258 nm initiates a resonant one photon dissociation into neutral fragments, which results in C-I bond cleavage. The dissociation products are then strong-field ionized, using the IR probe pulse. Analysis of the delay-dependent kinetic energy release, for each fragmentation channel, allows the time evolution of the internuclear distance to be extracted. The results highlight the sensitivity of Coulomb explosion imaging as probe of structural dynamics on ultrafast timescales.

*This project is supported by the Chemical Science, Geosciences, and Bio-Science division, Office of Basic Energy Science, Office of Science, U.S. Department of Energy. K.R.P. thanks NSF-EPSCOR for their support.

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Authors

  • Farzaneh Ziaee

    • J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA
    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan KS, USA
    • Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506

  • Kurtis Borne

    • Kansas State Univ
    • Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506

  • Kanaka Raju Pandiri

    • J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA
    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan KS, USA
    • Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506

  • B. Kaderiya

    • J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA
    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan KS, USA
    • Department of Physics, Kansas State University, Manhattan KS, USA

  • Yubaraj Malakar

    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506
    • Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506

  • Travis Severt

    • J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA
    • J.R. Macdonald Laboratory, Physics Department, Kansas State University, Manhattan, KS 66506, USA
    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan KS, USA
    • Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506

  • Itzik Ben-Itzhak

    • J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA
    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan KS, USA
    • Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506

  • Artem Rudenko

    • J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506 USA
    • Kansas State University
    • J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan KS, USA
    • Department of Physics, Kansas State University, Manhattan KS, USA
    • J.R. Macdonald Laboratory, Kansas State University, Manhattan, KS 66506

  • D. Rolles

    • Department of Physics, Kansas State University, Manhattan KS, USA

  • R. Forbes

    • Department of Physics, University of Ottawa, Ottawa, Canada
    • University College London, UK, University of Ottawa, Canada
    • University College London, University of Ottawa