title: Collisional quenching of rotations in lithium dimers by ultracold helium: the Li2(a3Sigma u+) and Li2+(X2Sigma g+) targets.
abstract: Quantum coupled-channel scattering calculations have been carried out at ultralow energies (down to 10(-5) K) for rotational quenching of ionic and spin-stretched states of the lithium dimer in collision with He atoms. Marked cross section differences, to be related to changes in their interactions with He, have been observed with respect to the singlet case while little changes in the collisional behavior are seen to occur upon ionization when the spin-stretched target is considered. Both effects originate from an interplay of structural and dynamical features of the colliding partners which are analyzed in detail.
authors.affiliation: Department of Chemistry, University of Rome La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy.
authors.forename: L
authors.initials: L
authors.lastname: González-Sánchez
authors.forename: E
authors.initials: E
authors.lastname: Bodo
authors.forename: F A
authors.initials: FA
authors.lastname: Gianturco