Depolarized Rayleigh scattering in normal and para-hydrogen

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Abstract
An expression for the shape of pressure-broadened rotational lines is obtained by perturbation techniques which account for the details of binary collisions. This expression is used for a numerical computation of the depolarized far wing of the hydrogen Q0(1) line, a Raman line at zero frequency shift, at moderate gas density (1–100 amagat). Agreement of the computed profile with an extraction of this line wing from recent measurements of the depolarized Rayleigh spectra of para- and normal hydrogen is reported in absolute intensity units. The depolarized, collision induced Rayleigh spectra, a background present in these measurements, is shown to be very nearly the same in para- and normal hydrogen.

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