Chinese Physics Letters

Saturation of Photoassociation in Cs Magneto-optical Trap

Jie Ma, Wang Li-Rong, Ji Wei-Bang, Liantuan Xiao, Jia Suo-Tang

Published Jun 28, 2007• 10 citations

Abstract

An ultrahigh resolution photoassociation spectrum of caesium atoms in a magneto-optical 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 rotational 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 experimental data to a saturation model based on scattering theory. Differences among saturation intensities of different rotational progressions in the ν = 55 vibrational state of the caesium molecular long-range 0 g − state have been found.

DOI: 10.1088/0256-307x/24/7/032

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Chinese Physics Letters

Saturation of Photoassociation in Cs Magneto-optical Trap

Jie Ma, Wang Li-Rong, Ji Wei-Bang, Liantuan Xiao, Jia Suo-Tang

Published Jun 28, 2007• 10 citations

Publisher

Abstract

DOI: 10.1088/0256-307x/24/7/032

Related papers

The laser-intensity dependence of the photoassociation spectrum of the ultracold Cs2（6S1/2 ＋ 6P1/2） 0＋ long-range molecular state

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PHOTOASSOCIATIVE SPECTROSCOPY OF

Cs_{2}

MOLECULE

We report the spectroscopy of molecular

1_{g}, 0^{+}_{u}, 0^{-}_{g}

and

1_{u}

state potentials below the dissociattion limit

6s^{2}S_{1/2}+6p^{2}P_{3/2}

by using the molecular photoassociation technique of cold Cs atoms, in a vapor-cell magneto-optical trap. The

1_{g}

and

0^{+}_{g}

states are detected by trap losses. The

0^{-}_{g}

and

1_{u}

states, which lead to the formation of cold molecules [1], are detected by photoionizing them into

Cs_{2}^{+}

and detecting with a time-of-flight mass spectrometer, while the

l_{g}

and

0^{+}_{u}

states are detected by trap losses. We give the spectra of the whole series

0^{-}_{g}

and

1_{u}

. The

0^{-}_{g}

series is analyzed in a RKR approach and the hyperfine structure of the

1_{u}

series will be discussed. The observed modulation of intensities of the lines is due to Franck Condon factors characterizing the photoassociative transition between the initial state of two free atoms and the finalro-vibrational level. The intensity modulation can give access to the scattering lengths of the ground state. This possibility will be discussed.