TITLE

Many-body effects in the stimulated Raman response of binary mixtures: A comparison between theory and experiment

AUTHOR(S)
Jansen, Thomas l. C.; Pugzlys, Audrius; Crı⁁ngus¸, Gheorghe Dan; Snijders, Jaap G.; Duppen, Koos
PUB. DATE
June 2002
SOURCE
Journal of Chemical Physics;6/1/2002, Vol. 116 Issue 21, p9383
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The subpicosecond dynamics of binary mixtures of carbon disulfide and alkane have been studied using third-order time-resolved Raman techniques. Both the anisotropic and the isotropic responses were investigated. These depend differently on many-body contributions to the first-order susceptibility and probe different modes in the liquid. The anisotropic response is dominated by single molecule effects, whereas the isotropic response is completely determined by many-body contributions since the single molecule response vanishes. To interpret the experimental results, molecular dynamics simulations were performed on model mixtures. The effect of dilution on the subpicosecond response cannot be explained by many-body effects in the first-order susceptibility alone. Aggregation due to permanent quadrupole moments on the carbon disulfide molecules and density changes upon dilution are also inadequate explanations for the observed effect. Apparently the character of the many-body dynamics itself is modified by the change of the molecular force fields, when carbon disulfide molecules are replaced by alkanes.
ACCESSION #
6637773

 

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