Abstract
Vibrational dephasing reflects the molecular dynamics of a liquid and the coupling of that motion to intramolecular coordinates. Both isotropic Raman line- shapes and time-resolved coherent Raman scattering have been extensively used to measure dephasing in liquids.1,2 However, these experiments cannot directly determine whether the dephasing is caused by homogeneous or inhomogeneous processes, a distinction that is critical for interpretation of the data. Homogeneous broadening is caused by very rapid (typically <1 ps) solvent motions, and the resulting dephasing time is controlled by both the strength and the speed of the vibration-solvent interactions. Inhomogeneous broadening implies the existence of long- lived local structures in the liquid, and the resulting deplrasing time is a direct measure of the coupling between these structures and the vibration.
© 1992 Optical Society of America
PDF ArticleMore Like This
Mark Berg and David Vanden Bout
SThA5 Modern Spectroscopy of Solids, Liquids, and Gases (MSSLG) 1995
Laura J. Muller, David Vanden Bout, and Mark Berg
TUB4 International Conference on Ultrafast Phenomena (UP) 1992
Qing-Hua Xu and M. D. Fayer
TuA2 International Conference on Ultrafast Phenomena (UP) 2002