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    • Time-resolved Auger-Meitner Spectroscopy of the Photodissociation Dynamics of CS2

    Henry J. Thompson,Oksana Plekan，Russell S. Minns,Michele Di Fraia

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS（2024）

    Univ Southampton

    Cited 1|Views10
    Abstract
    The photodissociation dynamics of UV excited CS2 are investigated using time-resolved Auger-Meitner (AM) spectroscopy. AM decay is initiated by inner-shell ionisation with a femtosecond duration x-ray (179.9 eV) probe generated by the FERMI free electron laser. The time-delayed x-ray probe removes an electron from the S(2p) orbital leading to secondary emission of a high energy electron through AM decay. We monitor the electron kinetic energy of the AM emission as a function of pump-probe delay and observe time-dependent changes in the spectrum that correlate with the formation of bound, excited-state CS2 molecules at early times, and CS + S fragments on the picosecond timescale. The results are analysed based on a simplified kinetic scheme that provides a time constant for dissociation of approximately 1.2 ps, in agreement with previous time-resolved x-ray photoelectron spectroscopy measurements.
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    Key words
    Auger spectroscopy,free electron lasers,time-resolved x-ray spectroscopy
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