Abstract
Highly sensitive photoassociation spectroscopy is reported using the modulation technique in a Cs atom magneto-optical trap. Spectral data are extended to red detunings of 70 cm −1 below the Cs 6S 1/2 + 6P 3/2 dissociation limit. Long vibrational progressions are assigned to the 0 u + and 1 g long-range molecular excited states. Some low-lying vibrational levels are first observed for the 0 u + and 1 g states. By fitting the experimental data using the semiclassical LeRoy–Bernstein equation, the long-range molecular coefficients C 3 of the 0 u + and 1 g states are obtained. The present C 3 values are closest to the theoretical values compared with the experimental results reported in earlier publications. Empirical potential curves in the long-range region are derived from these data.
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