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Determination of rotational constants in a molecule by femtosecond four‐wave mixing
Author(s) -
Frey H. M.,
Beaud P.,
Gerber T.,
Mischler B.,
Radi P. P.,
Tzannis A. P.
Publication year - 2000
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/(sici)1097-4555(200001/02)31:1/2<71::aid-jrs496>3.0.co;2-d
Subject(s) - femtosecond , molecule , raman spectroscopy , mixing (physics) , chemistry , analytical chemistry (journal) , materials science , molecular physics , optics , physics , laser , chromatography , organic chemistry , quantum mechanics
Femtosecond time‐resolved DFWM experiments were performed on CHCl 3 and SO 2 . The recurrences observed originate from the preparation of rotational coherences within the sample. The determination of rotational constants for a symmetric and an asymmetric top are shown. The simulation of the transients for the symmetric top allows the extraction of the main moment of inertia B and the centrifugal terms perpendicular to the molecule axis. For the asymmetric top, all three rotational constants can be derived. In addition to the transients at 1/2( B + C ), two additional types of asymmetry transients at 1/4 C and 1/4 A arise from this experiment. The first origins from the levels at low K and the second from the levels at high K in the high‐ J limit. Copyright © 2000 John Wiley & Sons, Ltd.