Large vibrrtion-rotation interaction effects have been found in the relative line intensities measured for three Lyman band progressions of HD. Franck-Condon factor calculations which account for the tentrifugzl potential lead to good agreement between theoretical and observed line intensity ratios. Studies of rotation-translation and vibrationtranslation energy transfer processes in monochromatically excited hydrogen-deuteride molecules [l] require an accurate knowledge of relative line and band transition probabilities in the Lyman system of HD. Recently Halmann and Laulicht [Z] and Villarejo et al. [3-51 reported large vibration-rotation interaction effects in calculated Franck-Condon factors for individual Lines of the Lyman bands of H2. In a number of bands the Franck-Condon factors for different rotational lines were found to differ by several orders of magnitude. A smaller but still appreciable dependence of the Franck-Condon factors on the rotational quantum numbers previously had been calculated for the cases of OH [6] and RbH [?I. Very few experimental data have been available which yield tests for these calculations. Villarejo et al. 15) compared their calculated relative band strengths of the (u',u" = 0) Lyman bands with experimental {Mensities given by Geiger and Topschowsky [8], as well as calculated ratios of corresponding R and P lines of some Pulcher bands of hydrogen with experimental data from Ginsburg and Dieke 191. They found large discrepancies between the theoretical and experimental results. Monochromatic excitation o.f HD molecule: through absorption of the 1048A and the 1066A