Quantum Dynamics of Ultracold Na + Na2 collisions
Abstract
Ultracold collisions between spin-polarized Na atoms and vibrationally excited Na2 molecules are investigated theoretically, using both an inelastic formalism (neglecting atom exchange channels) and a reactive formalism (including atom exchange). Calculations are carried out on both pairwise additive and non-additive potential energy surfaces for the quartet electronic state. In both inelastic and reactive calculations, the Wigner threshold laws are followed for energies below 10-6 K. It is found that vibrational relaxation processes dominate elastic processes for temperatures below 10-3 - 10-4 K. For temperatures below 10-5 K, the rate coefficients for vibrational relaxation (v = 1 -> 0) from the full calculation are 4.8 x 10-11 and 5.2 x 10-10 cm3 s-1 for the additive and non-additive potentials respectively.
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