Four schemes for constructing rotational-orbital basis sets for rotational close coupling calculations for atom-molecule. collisions are considered and are applied to calculate 0 → 1, 0 → 2, and 0 → 3 rotational excitation cross sections for He+ HF at energies 0.05 and 0.017 eV. Adiabatic basis sets are shown to converge faster than conventional basis sets in all cases; in some cases the difference is very dramatic. Further, l-dominant bases are shown to be useful for the 0 → 2 and 0 → 3 cross sections.
Bibliographical noteFunding Information:
This work wass upportedin part by the National ScienceF oundation underg rantn umberC HE77-27415,b y a grantf rom the GraduateS chool of the Universityo f Minnesota,a nd by a computert ime subsidy from the Universityo f MinnesotaC omputerC enter. We areg ratefult o the authorso f refs. [SJ and  for communicatingth eir resultsp rior to publication.