Abstract
Derivations of appropriate kinetic-theory expressions for the depolarized Rayleigh (DPR) spectral lineshape function and its corresponding time auto-correlation function are presented for the single-moment, two-moment and multilevel descriptions of light scattering in dilute polyatomic gases. A comparison is given between the predictions of these descriptions, using close-coupled scattering calculations of the relevant reorientation collision cross-sections for HD and N2 interacting with He. The role of inelastic reorientation cross-sections is elucidated. The decay of fluctuations in the non-equilibrium average of the microscopic orientational polarization (4j 2 - 3)-1 , which is responsible for the DPR spectrum, is sensitive to the transfer of this polarization between the rotational levels of HD (or N2) as the result of inelastic molecule-He reorientation collisions. It is shown that the single-moment description is adequate only for HD at very low temperatures (never for N2), and that the two-moment d...
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