Raman Bandshapes and Rotational Diffusion of Molecules
Abstract
It is shown that the shapes of vibrational Raman bands, measured with both parallel and crossed nicols, may serve as a tool for the study of the reorientation of rigid molecules (or molecular fragments) even if other line- broadening mechanisms are not negligible. The theory, developed for the case of isotropic media (including dense gases, liquids, and some molecular solids), holds independently of the shape of the molecules; the only requirement is that the studied band must be related to a vibration which is sufficiently localized to the individual molecule (molecular fragment). An exhaustive characterization of the reorientation properties of all second-rank molecular quantities is shown to be probably out of the reach of Raman spectroscopy except when the molecule (molecular fragment) has a high symmetry and/or a specific model of the reorientation process is accepted.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1971
- Accession Number
- AD0724330
Entities
People
- Stanislav Sykora
Organizations
- University of Illinois Urbana–Champaign