The rovibrational structure of the He-CO complex from a model interaction potential

The full dimensional potential energy surface for the He-CO complex, V(R, t heta, r(CO)), has been calculated using a recently developed scheme which c ombines density functional theory with the long range dispersion contributi ons obtained from perturbative theory. Then the two adiabatic surfaces obta ined by the integration of the full potential over the vibrational coordina te of CO have been used to calculate the bound states of the van der Waals complex for both nu (CO) = 0 and nu (CO) = 1. Calculations of the wavefunct ions and of the frequencies of various rotational and rovibrational transit ions is seen to provide good overall agreement with the available experimen ts on the title system.