A spectroscopic study of the E 1Σ+g and F 1Σ+g states of 7Li2 by pulsed optical–optical double resonance

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Abstract
The results of pulsed optical–optical double resonance spectroscopic studies of the E 1S+g and F 1S+g states of 7Li2 are presented. Observations were carried out on the v = 0 through v = 30 levels of the F 1S+g state, representing about 60% of the dissociation energy. A set of Dunham molecular constants was derived and an RKR potential was generated. Franck–Condon factors were determined for the range of observed vibrational levels. The spectroscopic results on the E 1S+g state are preliminary and are included because of a probable homogeneous anticrossing between it and the F 1S+g state. It is suggested that the E 1S+g state correlates with the (2 2S)+(3 2S) atomic lithium states while the F 1S+g correlates with the (2 2P)+(2 2P) states.