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Hyperfine-changing collisions in an optically trapped gas of ultracold cesium and lithium

: Mudrich, M.; Kraft, S.; Lange, J.; Mosk, A.; Weidemüller, M.; Tiesinga, E.


Physical Review. A 70 (2004), No.6, pp.062712-1 - 062712-9
ISSN: 0556-2791
ISSN: 1050-2947
ISSN: 1094-1622
Journal Article
Fraunhofer IPM ()

The rate coefficients for hyperfine-changing collisions of ground-state 133Cs and 7Li atoms trapped in a quasielectrostatic trap (QUEST) were investigated. The rate coefficients G(4,4) for hyperfine-changing collisions of Cs atoms in the upper hyperfine ground state |F=4 was found to be 1.1 x 10-11 cm3s-1 in the temperature range between 30 and 130 K. Absorption imaging was used to detect the Cs atom number, density and temperature. It was concluded that the behavior of a mixture of Li and Cs atoms that was analyzed using coupled rate equations can result the rate coefficients for all possible combinations of hyperfine ground states.