High precision photoassociation spectroscopy is performed in ultracold cesium gas, with detunings as large as 51 cm−1 below the Cs(6S1/2)+Cs(6P3/2) asymptote. Trap-loss fluorescence detection is used for detecting the photoassociation to excited state ultracold molecules. Long vibrational progressions are assigned to electronic states of 0g,0u+, and 1g symmetry. The spectral data are fitted to a LeRoy-Bernstein equation, in order to obtain the effective coefficients of the leading long-range interaction term (C3/R3) and the relative vibrational quantum numbers measured down from dissociation. Additionally we present evidence for perturbations between the 0g state and the dark 2u state.

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