Higher order collision induced Raman scattering from the dipole forbidden v₉ mode of ethane

Abstract

The interaction induced v ₉ signal from ethane has been observed by conventional Raman techniques. This mode is formally forbidden by the dipole-polarizability selection rules, but can be activated by higher order hyperpolarizability and/or quadrupole polarizability mechanism. Ethane was studied under four temperature and seven reduced density conditions. From these experimental results the specific multipole mechanism giving rise to v ₉s activity has been determined. The appearance of a three body, R ₃, term has been observed and its spherical tensor rank has been determined. The data have been interpreted by means of Buckingham's multipole expansion model.

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Notes on contributors

H. Versmold

On leave from: Department of Chemistry, University of Nevada Reno, Reno, Nevada 89557-0020, U.S.A.