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Quantum dynamics of ultracold Na+Na-2 collisions.

Soldan, P. and Cvitas, M. T. and Hutson, J. M. and Honvault, P. and Launay, J. M. (2002) 'Quantum dynamics of ultracold Na+Na-2 collisions.', Physical review letters., 89 (15). p. 153201.


Ultracold collisions between spin-polarized Na atoms and vibrationally excited Na2 molecules are investigated theoretically, using a reactive scattering formalism (including atom exchange). Calculations are carried out on both pairwise additive and nonadditive potential energy surfaces for the quartet electronic state. The Wigner threshold laws are followed for energies below 10-5   K. 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) are 4.8×10-11 and 5.2×10-10   cm3 s-1 for the additive and nonadditive potentials, respectively. The large difference emphasizes the importance of using accurate potential energy surfaces for such calculations.

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Publisher statement:© 2002 by The American Physical Society. All rights reserved.
Record Created:19 Apr 2007
Last Modified:20 Sep 2010 16:14

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