Behavior of as a function of .
Experimental details. (a) Schematic of experimental setup and a block diagram of the acoustic measurement system. (b) Photograph of a vacuum-sealed polymer film/tungsten plate interface, where the air between the film and the tungsten plate is evacuated by a diaphragm-type vacuum pump.
Results of the frequency analysis. (a) Amplitude spectra of the back-wall echoes of the tungsten plate with and without the polymer film. (b) Amplitude ratio .
Acoustic properties of measured polymer films. Bulk constants are in parentheses.
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