Abstract

The temperature of the remaining trapped 87Rb atoms gradually decreases as the intensity of the ionizing lasers increases. And the relationship between the temperture and atom number of the remaining 87Rb atoms follows an exponential law. This is mainly due to that the photoionized atoms in the state of 5 2P3/2 have higher velocity caused by the detuning of cooling laser, and they escape from the trap after becoming ions. In addition, ion-atom interaction may play a role at a higher ion density.

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