Abstract
The 3 1Π g state of Na 2 is experimentally investigated by using high resolution cw optical–optical double resonance spectroscopy. A single line Ar + laser (total of 9 lines) is used to pump the sodium dimers from thermally populated ground state X 1 Σ g + to the intermediate B 1Π u state. Then a single mode Ti:sapphire laser is used to probe the 3 1Π g state. Violet fluorescence from highly Rydberg excited states (mainly 2 3Π g or 3 3Π g states which are transferred from 3 1Π g state via collisions) to the a 3 Σ u + state is monitored by a filtered photomultiplier tube and a lock-in amplifier. Compared with previous studies [C.C. Tsai, J.T. Bahns, W.C. Stwalley, J. Chem. Phys. 99 (1993) 7417], a wider range of rotational quantum numbers of data field are observed. A set of Dunham coefficients and the Rydberg–Klein–Rees potential energy curve of the 3 1Π g state are deduced from all the observed rovibrational levels.
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