We have realized a two-species mirror-magneto-optical trap containing a mixture of ⁸⁷Rb0.3em0ex(⁸⁵Rb) and ¹³³Cs atoms. Using this trap, we have measured the heteronuclear collisional loss rate βRb-Cs^' due to intraspecies cold collisions. We find a distinct difference in the magnitude and intensity dependence of βRb-Cs^' for the two isotopes ⁸⁷Rb and ⁸⁵Rb which we attribute to the different ground-state hyperfine splitting energies of the two isotopes.
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Holmes et al. (2004) studied this question.
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