The second relationship developed by Weinreich as described in {HEAD ~ Ultrasonic Attenuation} by {TAIL ~ Free Carriers} in Germanium Physical Review, 107, page 317 results in an electric field proportional to the acoustic energy lost to the free charge carriers 
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The second relationship developed by Weinreich as described in { HEAD ~ Ultrasonic Attenuation } by { TAIL ~ Free Carriers } in Germanium Physical Review , 107 , page 317 results in an electric field proportional to the acoustic energy lost to the free charge carriers
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