Raman-Active Resonance Modes, Overtones, and Anharmonicity in NaCl:Cu⁺

Authors

• B.N. Ganguly, University of Nebraska - Lincoln
• Roger D. Kirby, University of Nebraska-LincolnFollow
• M.V. Klein, University of Nebraska - Lincoln
• G.P. Montgomery Jr., University of Nebraska - Lincoln

Document Type

Article

Date of this Version

January 1972

Comments

Published by American Physical Society. Phys. Rev. Lett. 28, 307 (1972). http://prl.aps.org. Copyright © 1972 American Physical Society. Permission to use.

Abstract

The existence of an impurity-activated E_g resonance mode in NaCl:Cu⁺ has been suggested by several previous experiments. Raman data presented here reveal this resonance directly and also reveal the three components of the first overtone of the 23.5-cm^-1 infrared resonance mode. The frequencies of the E_g resonance and the E_g component of the overtone are shifted as a result of a strong anharmonic coupling. Their line shapes and strengths are considerably altered by an interference between the Raman amplitudes. A reasonable fit to the data has been obtained using a simple theory.