Düsseldorf 2007 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 56: Poster: Femtosecond Spectroscopy
MO 56.9: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster A
Molecular Dynamics Investigation with Time-Resolved Optical Kerr Effect on CS2 - C6H6 and CS2 - PS Mixtures — •Ismael A. Heisler1, Tiago Buckup2, Silvio L.S. Cunha1, and Ricardo R.B. Correia1 — 1Instituto de Física, UFRGS, 91501-970 Porto Alegre, Brazil — 2Physikalische Chemie, Philipps Universität Marburg, D-35032 Marburg, Germany
The low frequency domain of the spectral density associated to the liquid state is a peculiar region where the discrimination among different relaxation processes is not so far clearly defined. To obtain information about this region, we applied time resolved heterodyne detected optical Kerr effect technique (HD-OKE) to a series of carbon disulfide - benzene (CS2-C6H6) and carbon disulfide - polystyrene (CS2-PS) mixtures. CS2-C6H6 mixtures simulate the interactions between the CS2 molecules with phenyl rings, which are the principal interacting structures present in the PS molecules. The results show that the diffusive times for pure liquids and the mixtures follow the Debye-Stokes-Einstein equation. The fast time constants were analyzed in terms of the non-diffusive component of the spectral response, which is directly associated with the molecular dynamics. The variations of the spectra were quantified and explained in terms of structural interaction configurations which produced changes in the intermolecular potential.