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Femtosecond degenerate four‐wave mixing study of benzene in the gas phase
Author(s) -
Matylitsky V. V.,
Jarzȩba W.,
Riehn C.,
Brutschy B.
Publication year - 2002
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.945
Subject(s) - supersonic speed , femtosecond , benzene , chemistry , degenerate energy levels , molecule , mixing (physics) , raman spectroscopy , spectroscopy , choked flow , molecular physics , atomic physics , jet (fluid) , four wave mixing , analytical chemistry (journal) , laser , optics , nonlinear optics , physics , organic chemistry , thermodynamics , quantum mechanics
We report on time‐resolved rotational spectroscopy of benzene molecules both in a gas cell at room temperature (298 K) and in a supersonic expansion (30 K) by femtosecond degenerate four‐wave mixing (fs‐DFWM). A detailed study of the time‐dependent structure of the rotational recurrences for the gas cell is presented. Moreover, for the first time, the fs‐DFWM technique has been applied to a medium‐sized molecule in the collision‐free environment of a seeded supersonic expansion up to a time delay of 4 ns. From these data, by fitting of the experimental spectra, a rotational constant B = 5688.95 ± 0.55 MHz was obtained for benzene in the gas cell and B = 5689.25 ± 0.11 MHz for benzene in the supersonic expansion. The combination of gas cell and supersonic jet investigations by fs‐DWFM provides a means for the structural study of large and more complex molecules. Copyright © 2002 John Wiley & Sons, Ltd.