Abstract

The total collisional cross sections of caesium Rydberg 40 S state is obtained by measuring the corresponding effective decay rates as a function of Rydberg atoms density in a conventional magneto-optical trap using the state-selective pulse field ionization technique. We investigate the collisional properties for different Rydberg atomic densities in detail. The results indicate that the Rydberg atomic interaction induced collisions is the dominant mechanism leading to the large collisional cross sections.

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