Accurate Measurement of Raman Depolarization Ratio in Gaseous CO₂

The Raman depolarization ratios of gaseous CO₂ in the spectral range of 1240-1430 cm^-1 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.