Intensities of Rv’ (0) transitions in solid HD

Experimental values of the integrated intensity of the zero-phonon ${R}_{2}$(0) and ${R}_{3}$(0) transitions in solid HD are reported. Three distinct dipole components, the allowed dipole and the dipoles induced by the shifted, isotropic and anisotropic overlap mechanisms, in conjunction with their associated interferences, all play an important role in the absorption process. A two-parameter model describing the dependence of the induced dipoles on the internuclear separation is constructed. The parameters in this model are then determined by fitting to the previously observed ${R}_{1}$(0) and the newly measured ${R}_{2}$(0) intensities. The ${R}_{3}$(0) transition intensity predicted by our model agrees well with the experimental value, and the present model also enables us to refine the theoretical calculation of the intensity of the ${R}_{0}$(0) transition published previously.