Quantum dynamics of ultracold Na+ Na2 collisions.

摘要: Ultracold collisions between spin-polarized Na atoms and vibrationally excited ${\mathrm{N}\mathrm{a}}_{2}$ molecules are investigated theoretically, using a reactive scattering formalism (including atom exchange). Calculations carried out on both pairwise additive nonadditive potential energy surfaces for the quartet electronic state. The Wigner threshold laws followed energies below ${10}^{\ensuremath{-}5}\text{ }\mathrm{K}$. Vibrational relaxation processes dominate elastic temperatures ${10}^{\ensuremath{-}3}--{10}^{\ensuremath{-}4}\text{ For }\mathrm{K}$, rate coefficients vibrational ($v=1\ensuremath{\rightarrow}0$) $4.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ $5.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}\text{ }{\mathrm{c}\mathrm{m}}^{3}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ potentials, respectively. large difference emphasizes importance of accurate such calculations.