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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
We have measured the interspecies trap loss rate coefficient. The experiment was measured the rubidium atom trap loss rate coefficient as a function of Rb trapping laser intensity by loading process for rubidium atom in either presence or absence of cesium atomic cloud. The trap loss rate coefficient decreases as the Rb trapping laser intensity increases where the trap loss caused by hyperfine-state changing collision is suppressed due to the increasing Rb trap depth. The corresponding Rb trapping laser intensities are 7.8 mW/cm2, 12.1 mW/cm2 and 34.7 mW/cm2 respectively. The experimental results agree with the calculated critical intensity IC of Rb trapping laser by a simple Doppler model.