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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