The broadening of the Depolarized Rayleigh line for hydrogen isotopes at low temperatures

Measurements of the collisional broadening of the Depolarized Rayleigh (DPR) line have been performed for the hydrogen isotopes H2, D2 and HD at various temperatures between 28 K and 293 K. For H2 the dependence of the broadening coefficient on the ortho-para composition has also been investigated. The results are compared with the theoretical calculations based on a distorted wave Born approximation (DWBA) by Coombe and Köhler. Good agreement has been found.