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VOLUME 45 (1987) | ISSUE 2 | PAGE 85
Spectral diffusion in glasses at low temperatures. The "burned-out hole" phenomenon and nonlinear resonant microwave and sound absorption
The basic principles of the quantitative theory of spectral diffusion in glasses at low temperatures are discussed. In this diffusion the two-level systems are responsible for the resonant absorption of sound and for the microwaves. Expressions are obtained for the shape of the "burned-out hole" and for the correction to the resonant-absorption factor, which is proportional to the intensity of sound or microwave radiation.