Accession Number : AD0652935

Title :   ACOUSTICAL ACTIVITY AND RELATED PHENOMENA IN CRYSTALS.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS

Personal Author(s) : Portigal,David Lawrence

Report Date : MAY 1967

Pagination or Media Count : 201

Abstract : Rotatory polarization of transverse acoustic waves is considered. It is demonstrated phenomenologically that, due to spatial dispersion, such 'acoustical activity' should be observable in optically active crystal classes, its magnitude being obtainable from phonon dispersion curves. An estimate of the acoustical activity of tellurium is so obtained. An attempt to measure the acoustical activity of tellurium is described. Alignment requirements are shown to be too critical to detect activity in such trigonal crystals. The effect of conical refraction on the observation of acoustical activity is considered. A similar formalism is applied to an improved study of optical internal conical refraction. (Author)

Descriptors :   (*CRYSTALS, ACOUSTIC PROPERTIES), (*TELLURIUM, ACOUSTIC PROPERTIES), (*PHONONS, CRYSTALS), MECHANICAL WAVES, POLARIZATION, SCATTERING, REFRACTION, OPTICAL PHENOMENA, BRILLOUIN ZONES, DIFFRACTION, ELASTIC PROPERTIES, CRYSTAL LATTICES

Subject Categories : Acoustics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE