BRILLOUIN-SCATTERING IN SINGLE-CRYSTALS OF BETA-CARBON MONOXIDE - DETERMINATION OF THE ELASTIC-CONSTANTS AT THE TRIPLE POINT

The technique of high resolution Brillouin spectroscopy has been used to determine the adiabatic elastic constants of oriented single crystals of β-carbon monoxide at temperatures near the triple point. The values obtained at 67.7 K were C11 = 1.9(01), C12 = 1.1(46), C13 = 0.9(51), C33 = 2.0(95) and C44 = 0.35(5) (in units of 109 Nm-2) with an estimated uncertainty of ±2%. The similarities to β-nitrogen results are striking; nevertheless, significant differences are noted. © 1979 American Institute of Physics.