THEORETICAL CHEMISTRY ACCOUNTS, cilt.112, sa.4, ss.263-269, 2004 (SCI-Expanded)
The very weak interaction of Li-2 with He atoms has been obtained from accurate ab initio calculations and is here analyzed in terms of its anisotropic features. Quantum scattering calculations of the rotational inelastic de-excitation cross sections are carried out using a recently proposed multichannel treatment, the modified variable phase method, implemented by the authors and applied here to ultralow collision energies. General conclusions on the low efficiency of a He buffer gas in cooling down molecular rotations in this system are presented and analyzed.