Naslov
Quantum dynamics of ultracold Na+Na2 collisions

Autori
Cvitaš, Marko Tomislav ; Soldan, P. ; Hutson, J.M. ; Hovault, P. ; Launay, J.-M.

Izvornik
Physical review letters (0031-9007) 89 (2002), 15; 153201, 4

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ATOM-MOLECULE COLLISIONS ; BOSE-EINSTEIN CONDENSATE ; VIBRATIONAL-RELAXATION ; TEMPERATURES ; SCATTERING ; INSERTION ; THRESHOLD ; HE-3 ; CO

Sažetak
Ultracold collisions between spin-polarized Na atoms and vibrationally excited Na-2 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 4.8x10(-11) and 5.2x10(-10) cm(3) s(-1) for the additive and nonadditive potentials, respectively. The large difference emphasizes the importance of using accurate potential energy surfaces for such calculations.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA