We investigate collisional properties of lithium and cesium which aresimultaneously confined in a combined magneto-optical trap. Trap-losscollisions between the two species are comprehensively studied. Differentinelastic collision channels are identified, and inter-species ratecoefficients as well as cross sections are determined. It is found that lossrates are independent of the optical excitation of Li, as a consequence of therepulsive Li$^*$-Cs interaction. Li and Cs loss by inelastic inter-speciescollisions can completely be attributed to processes involving opticallyexcited cesium (fine-structure changing collisions and radiative escape). Bylowering the trap depth for Li, an additional loss channel of Li is observedwhich results from ground-state Li-Cs collisions changing the hyperfine stateof cesium.
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