Isotropic Raman band shape and vibrational relaxation for molecules in the liquid state: A Critical study of some band shape functions

Abstract

A band shape function for the isotropic Raman scattering described in terms of the band width in the weak coupling limit and the relaxation time of the bath mode has been proposed by summing the results of Berne el al. [ J . Chem. Phys. 45, 1086 (1966)X Wang [Mol. Phys. 33, 207 (1977)l and Knauss [Mol. Phys. 36,413 (1978)l. The results of band analyses with this function have been compared with those obtained frum other conventionally used band shape and correlation functions. The present function is preferable for precise interpretation of vibrational relaxation mechanisms, particularly for those cases where temperature and concentration dependence of the band parameters are involved.

Combinatorial Broadening Mechanism of O–H Stretching Bands in H-Bonded Molecular Clusters

“…Because each molecular-cluster channel that is involved in combinatorial absorption-band broadening and the mechanism in general are related to the decreased lifetime of the excited vibrational state ν OH , the well-known relationship between the absorption-band half-width (Δν) and the average lifetime in the excited vibrational state (τ) can be used [20,[56][57][58][59] Δντ = 1/2π .…”

Unraveling the role of microenvironment and hydrodynamic forces on the vibrational relaxation rates of pyridine–water complexes

“…Several methods have been proposed for improving the study of dynamics through the vibrational band shapes [5][6][7]. By using Raman spectroscopy and analyzing changes in vibrational transition frequencies and band profile characteristics (i.e.…”