Accession Number : AD0619273

Title :   PHONON INTERACTIONS IN CRYSTALS.

Descriptive Note : Quarterly progress rept. no. 8, 15 Feb-14 May 65,

Corporate Author : IBM WATSON RESEARCH CENTER YORKTOWN HEIGHTS N Y

Personal Author(s) : Shiren,N. S. ; Pomerantz,M. ; von Gutfeld,R. J.

Report Date : 14 MAY 1965

Pagination or Media Count : 33

Abstract : The signal velocity of MASER amplified 16.45 Gc/sec ultrasonics was measured. The measured velocity was unchanged (within =1%) from the off resonance value. gains of as much as 23 db were obtained. The observed velocity change for 15 db absorption was 15%. A qualitative theory of signal velocity was derived and is in agreement with the observations. The attenuation of microwave phonons due to interaction with Ga acceptors in Ge was observed. All the transverse and longitudinal waves propagating on the (100) and (110) directions show effects due to the impurities. Heat pulses were observed in Bi, Sb and germanium at about 4K. Preliminary data on Bi and Sb leaves the question of whether electrons or phonons are the principal heat carriers unanswered. Heat pulse data for intrinsic germanium indicate that there is considerable phonon scattering though individual phonon modes are distinguishable. (Author)

Descriptors :   (*MASERS, PHONONS), (*MICROWAVES, ACOUSTICS), (*PHONONS, CRYSTALS), ULTRASONIC RADIATION, GAIN, ABSORPTION, SIGNALS, VELOCITY, THEORY, ATTENUATION, GERMANIUM, GALLIUM, PROPAGATION, SCATTERING, BISMUTH, ANTIMONY

Distribution Statement : APPROVED FOR PUBLIC RELEASE