Brillouin scattering in single crystals of bgr;hyphen;carbon monoxide: Determination of the elastic constants at the triple point

摘要

The technique of high resolution Brillouin spectroscopy has been used to determine the adiabatic elastic constants of oriented single crystals of bgr;hyphen;carbon monoxide at temperatures near the triple point. The values obtained at 67.7 K werec11=1.9(01),c12=1.1(46),c13=0.9(51),c33=2.0(95) andc44=0.35(5) (in units of 109Nmminus;2) with an estimated uncertainty of plusmn;2percnt;. The similarities to bgr;hyphen;nitrogen results are striking; nevertheless, significant differences are noted.