Abstract
Abstract The Brillouin scattering from tetragonal pentaerythritol crystals was measured by using a helium–neon laser and a pressure-scanned Fabry-Perot interferometer. The Brillouin components from the longitudinal acoustic mode and the transverse acoustic mode polarized parallel to the scattering plane were observed for various crystal directions with the scattering vector in the (001) and (010) planes. From the observed Brillouin shifts, the frequencies and velocities of sound waves with the wavelength of 290 nm were obtained, and the elastic constants were determined, in units of 1011 dyn/cm2, as C11=3.94±0.01, C13=0.76±0.03, C16=0.005±0.05, C33=1.33±0.02, C44=0.44±0.03, and 2C66+C12=5.13±0.03. The present hypersonic values of the elastic constants were compared with previous values by the ultrasonic technique.
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