Attenuation of hypersound at 34 GHz in evaporated Ag films

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Abstract
By means of multiple beam interferometry in evaporated wedge-shaped metal films and movable beam of coherent pulsed phonons it is possible to determine the attenuation and phase velocity of longitudinal and transverse hypersound in these films. With a pulse echo apparatus for 35 GHz the authors measured the phase velocity and the amplitude damping coefficient for longitudinal hypersound in evaporated silver films.