Abstract
Three ultrasonic techniques for the investigation of electron scattering are discussed. Firstly, geometric oscillations in the acoustic attenuation are shown to provide a method for the determination of orbitally averaged scattering rates (reciprocal lifetimes). Secondly, acoustic open orbit resonance linewidth measurements are shown to provide a method either for the determination of orbitally averaged scattering rates or, if the width of the open orbit band is not too narrow, to supply a means for the estimation of the magnitude of the average angle of scatter. Thirdly, it is argued that in simple metals such as the alkalis, gross features of the scattering mechanism such as Umklapp processes can be detected by their effects on the frequency dependence of the attenuation. These phenomena are illustrated with special reference to the scattering of electrons by thermal phonons, for which the acoustic technique seems to be particularly suited.
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