Abstract
The minimum in the reflection factor for a liquid-to-solid interface at the Rayleigh critical angle has never been adequately explained using classical methods. It will be shown that when attenuation is included in the calculations, by the method of Fitch and Richardson, [Progr. Appl. Mater. Res. 8, 79 (1967)], it is possible to predict this minimum. Experimental results have been obtained that demonstrate very good agreement with this theory. It will also be shown that the principal factor influencing the depth of the minimum is the attenuation of shear waves. Each material possesses a critical frequency for which the reflection factor reaches an absolute minimum, approximately zero. Relationships between this frequency and attenuation parameters are presented. The phase of the reflected wave is also shown to be influenced by attenuation. [This work was supported by the U. S. Atomic Energy Commission under contract.]
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