Knowledge Bank

We report the spectroscopy of molecular $1g,0u+,0g-$ and $1u$ state potentials below the dissociattion limit $6s2S1/2+6p2P3/2$ by using the molecular photoassociation technique of cold Cs atoms, in a vapor-cell magneto-optical trap. The $1g$ and $0g+$ states are detected by trap losses. The $0g-$ and $1u$ states, which lead to the formation of cold molecules [1], are detected by photoionizing them into $Cs2+$ and detecting with a time-of-flight mass spectrometer, while the $lg$ and $0u+$ states are detected by trap losses. We give the spectra of the whole series $0g-$ and $1u$. The $0g-$ series is analyzed in a RKR approach and the hyperfine structure of the $1u$ 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.