Hyperpolarizability of Helical Polymer Molecules and the Sampling of the ir-Active Optical Phonon Dispersion Curves
- 1 March 1969
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 50 (5) , 2244-2246
- https://doi.org/10.1063/1.1671356
Abstract
The selection rules for the inelastic three-photon scattering of light by helical molecules is obtained from group theoretical analysis. It is shown that the dispersion curve (frequency vs wave vector) for ir-active optical phonons may be sampled at four points throughout the Brillouin zone by measuring the frequency of the scattered light as a function of the polarization of both the incident (laser) and the scattered light provided that proper orientation of the laser light relative to the helix axis is maintained.Keywords
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