Open AccessCommunication: XUV transient absorption spectroscopy of iodomethane and iodobenzene photodissociation
Author(s) -
Lorenz Drescher,
M. C. E. Galbraith,
G. Reitsma,
Judith Durá,
N. Zhavoronkov,
S. Patchkovskii,
M. J. J. Vrakking,
Jochen Mikosch
Publication year - 2016
Publication title -
the journal of chemical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.071
H-Index - 357
eISSN - 1089-7690
pISSN - 0021-9606
DOI - 10.1063/1.4955212
Subject(s) - extreme ultraviolet , iodobenzene , chemistry , ultrafast laser spectroscopy , spectroscopy , femtosecond , excited state , absorption spectroscopy , atomic physics , photodissociation , valence (chemistry) , ultraviolet , photochemistry , materials science , laser , optics , optoelectronics , physics , biochemistry , organic chemistry , quantum mechanics , catalysis
Time-resolved extreme ultraviolet (XUV) transient absorption spectroscopy of iodomethane and iodobenzene photodissociation at the iodine pre-N4,5 edge is presented, using femtosecond UV pump pulses and XUV probe pulses from high harmonic generation. For both molecules the molecular core-to-valence absorption lines fade immediately, within the pump-probe time-resolution. Absorption lines converging to the atomic iodine product emerge promptly in CH3I but are time-delayed in C6H5I. We attribute this delay to the initial π → σ(*) excitation in iodobenzene, which is distant from the iodine reporter atom. We measure a continuous shift in energy of the emerging atomic absorption lines in CH3I, attributed to relaxation of the excited valence shell. An independent particle model is used to rationalize the observed experimental findings.
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