摘要
An ultrahigh resolution photoassociation spectrum of caesium atoms in a magneto-opticM trap is presented. Hyperfine structure of the excited state molecule is obtained by using the lock-in method based on modulated cold atoms in this spectrum. Amplitude of resonant lines related to the rotationM levels increases with photoassociation laser intensity~ and saturation effect of photoassociation of cold atoms is observed in our experiment. The saturation intensity of photoassociation is deduced by fitting the experimentM data to a saturation model based on scattering theory. Differences among saturation intensities of different rotational progressions in the u z 55 vibrational state of the caesium molecular long-range O^-g state have been found.
An ultrahigh resolution photoassociation spectrum of caesium atoms in a magneto-opticM trap is presented. Hyperfine structure of the excited state molecule is obtained by using the lock-in method based on modulated cold atoms in this spectrum. Amplitude of resonant lines related to the rotationM levels increases with photoassociation laser intensity~ and saturation effect of photoassociation of cold atoms is observed in our experiment. The saturation intensity of photoassociation is deduced by fitting the experimentM data to a saturation model based on scattering theory. Differences among saturation intensities of different rotational progressions in the u z 55 vibrational state of the caesium molecular long-range O^-g state have been found.
基金
Supported by the National Key Basic Research Programme of China under Grant No 2006CB921603, the National Natural Science Foundation of China under Grant Nos 10574084 and 60678003, the Special Foundation for State Major Basic Research Programme of China under Grant No 2005CCA06300, and the Youth Science Foundation of Shanxi Province under Grant No 20041013.
