Ultracold quantum dynamics: Spin-polarized K+K{sub 2} collisions with three identical bosons or fermions
- UMR 6627 du CNRS, Laboratoire de Physique des Atomes, Lasers, Molecules et Surfaces, Universite de Rennes, 35042 Rennes Cedex (France)
We have developed a potential-energy surface for spin-polarized K({sup 2}S)+K{sub 2}({sup 3}{sigma}{sub u}{sup +}) collisions and carried out quantum dynamical calculations of vibrational quenching at low and ultralow collision energies for both bosons {sup 39}K and {sup 41}K and fermions {sup 40}K. At collision energies above about 0.1 mK the quenching rates are well described by a classical Langevin model, but at lower energies a fully quantal treatment is essential. We find that for the low initial vibrational state considered here (v=1), the ultracold quenching rates are not substantially suppressed for fermionic atoms. For both bosons and fermions, vibrational quenching is much faster than elastic scattering in the ultralow-temperature regime. This contrasts with the situation found experimentally for molecules formed via Feshbach resonances in very high vibrational states.
- OSTI ID:
- 20650425
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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