中文摘要：

利用灵敏的光声拉曼光谱技术对气相二氧化碳分子在1240~1430cm-1振动光谱的拉曼退偏比进行了测量．通过测量并拟合光声拉曼信号强度随两束入射光偏振方向夹角的变化，得到了比文献报道中更为精确的退偏比数据．

英文摘要：

The Raman depolarization ratios of gaseous CO2 in the spectral range of 1240-1430 cm-I are determined with a sensitive photoacoustic Raman spectroscopy, and more accurate data compared to the literature results are presented. The precision of the obtained depolarization ratio is achieved by measuring and fitting the dependence of the PARS signal intensity on the cross angle between the polarizations of two incident laser beams.