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We have investigated photoassociative formation of RbCs molecules in the (2) 3 excited state correlated to v = 8, (5)0 + vibrational level in detail. The metastable ground-state RbCs molecules formed by spontaneous decay are ionized by pulsed dye laser through resonance-enhanced two-photon ionization. A rate equation of the photoionization process is introduced to explain the dependence of RbCs + molecular ion intensity on the ionization laser intensity. The saturation effect of molecular ion intensity appears as the photoassociation laser intensity increases. The rotational constant and centrifugal distortion constant are derived to be 0.01304 cm −1 and 0.000015 cm −1 from the photoassociation spectrum with a high sensitivity, respectively. The measured electric dipole moment of the observed (2) 3 state RbCs molecules is 4.7(6) D by Stark effect in static electric field.

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