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

高压声布里渊谱已应用于二氧化碳(CO_2)和一氧化二氮(N_2O)分子固体，压力高达6 GPa室温下。根据任意方向弹性波的EVE公式计算的布里渊声速与实验值之间的角度关系的最佳拟合度，得到了在金刚石顶高压室中生长的CO_2和N_2O立方相晶体的取向。可以对任何方向、折射率、密度和弹性常数进行作为压力函数的声速的现场测量。研究了等电子对CO_2和N_2O在压力诱导的液、固两相中的弹性性质

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