Raman intensities of Fermi diads. I. Overtones in resonance with nondegenerate fundamentals

Abstract

Expressions for the vibrational transition moments of the molecular polarizability involved in Fermi resonances of the type 2νs: νr (qs = single, doubly, or triply degenerate mode; qr = nondegenerate mode) are reported as a function of the observed splittings |X| and of the cubic force constant krss. Fermi resonances in H2O, CO2, CH4, and CD4 are interpreted in terms of bond polarizability parameters. © 1983 American Institute of Physics.