Analysis of theR1(J)- andP1(J)-Branch Absorption Spectrum of HD-Rare-Gas Mixtures: An Example of Positive Intercollisional Interference

A theory for the intensities and shapes of fundamental band $R_1\mathrm{}\left(J\right)\mathrm{}$ and $P_1\mathrm{}\left(J\right)\mathrm{}$ lines of HD under pressures of rare gases is presented, with specific application to the $R_1\mathrm{}\left(1\right)\mathrm{}$ line of HD-Kr. The absorption contours principally consist of a broad (∼100 ${\mathrm{cm}}^{-1\mathrm{}}$) feature representing the ordinary intracollisional dipole intensity, and narrow components arising from the small HD permanent dipole moment function; permanent-dipole-collisionally-induced-dipole interference; and positive intercollisional interference between dipoles induced in successive collisions.