COLLISION-INDUCED ABSORPTION BY H-2-HE PAIRS IN THE FUNDAMENTAL-BAND - ROTATIONAL STATES DEPENDENCE

Previously, we have computed the induced-dipole-moment surface of collisional H2-He complexes from first principles using highly correlated wave functions. These data were used to calculate the collision-induced absorption spectrum of the fundamental band [L. Frommhold and W. Meyer, Phys. Rev. A 35, 632 (1987)]. The present study examines the dependence of radial induced-dipole transition moments and the associated spectra on the rotational states involved, a dependence that was suppressed in the previous study. Whereas the neglect of the rotational quantum numbers j,j of the initial and final state of H2 is justified for the purely rototranslational spectra of H2-He, we find significant variations with j,j of the radial induced-dipole transition elements and the induced spectra for the fundamental band of H2. Similar effects are expected for other molecular bands and systems of interest, especially those involving hydrogen molecules. © 1990 The American Physical Society.