High-pressure Properties of Liquid and Solid CO_2 by Laser Brillouin Scattering

高压声波布里渊光谱已应用于压力高达6 GPa和室温下的分子固体二氧化碳（CO_2）和氧化亚氮（N_2O）。将布里渊声速的角依赖性实验值与任意方向弹性波的Every表达式的计算结果进行最佳拟合，得到了金刚石-砧砧高压电池中生长的CO_2和N_2O三相晶体的取向。声速作为压力的函数，可以在任何方向、折射率、密度和弹性常数上进行原位测定。研究了CO_2和N_2O等电子对在压力诱导液相和固相中的弹性性质

High-pressure acoustic Brillouin spectroscopy has been applied to molecular solids carbon dioxide (CO_2) and nitrous oxide (N_2O) at pressures up to 6 GPa and room temperature. The best fit of the angular dependence of Brillouin acoustic velocities between experimental values and calculations based on Every's expression for elastic waves of an arbitary direction yielded the orientation of CO_2 and N_2O cubic-phase crystal grown in the diamond-anvil high-pressure cell. In situ determinations of sound velocities, as a function of pressure, could be made for any direction, the refractive index, the density, and the elastic constants. The elastic properties of an isoelectronic pair, CO_2 and N_2O,are in vestigated in thier pressure-induced liquid and solid phases