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Physical Review A

Direct Measurement of Collisional Losses From a Cs Magneto-Optical Trap

A. Fioretti, Jörg Helge Müller, Philippe Verkerk, M. Allegrini, E. Arimondo, Paul S. Julienne

Published Jan 1, 1997• 2 citations
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Physical Review A•Jun 1, 1993•82 citations
Losses from a cesium magneto-optical trap induced by fine-structure changing collisions have been measured directly by counting of fluorescence photons emitted at the D1{\mathrm{D}}_{1}D1​ resonance line, with the trap lasers operating on the D2{\mathrm{D}}_{2}D2​ resonance line. The absolute value of the fine-structure loss rate coefficient has been measured and its dependence on the hyperfine state occupation has been explored. These results provide a fundamental test for the theoretical descriptions of excited-state trap losses.
Collisions between ultra-cold (T << 1K) atoms confined in a magneto- optical trap (MOT) may result in the ejection of atoms from the trap. These collisional loss processes, which involve ground state/excited state collisions, fundamentally limit the density attainable in MOT traps. Although accurate calculations of collision rates between ultra-cold atoms require precise knowledge of the molecular potentials over a long range, the loss rate for Li was recently predicted to be significantly less than for the other alkali metals. Motivated by this result, we are measuring the collisional loss rate of Li in a vapor-cell MOT using a red-detuned laser beam to catalyze the collisions, similar to recent experiments using Rb and Cs. We will report our progress to measure the trap loss rate for {sup 6}Li and {sup 7}Li, which will be compared to investigate an isotopic dependence, as was recently observed for Rb.