Observation of levels near dissociation in the X 1Σ+g state of 7Li2

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Abstract
The fluorescence spectrum of 7Li2 excited by a Kr+ (5682 Å) laser has been observed and analyzed. The laser simultaneously excites the A1Σ+u and the B1Πu states of the 7Li2 molecule. The analysis reveals two very interesting things: (a) the A–X spectrum consists of the transitions involving v″ levels of the entire ground state potential well (5≤v″≤36) and thus we have made the very first observation of the levels near the dissociation limit in the ground state of 7Li2, which suggests that D″e=8521.5±4 cm−1; and (b) the B–X spectrum is actually enhanced by the fluorescence from the A state which is an interesting single frequency analog of ‘‘modulated population spectroscopy’’ or ‘‘optical–optical double resonance’’ which we call ‘‘coupled laser induced fluorescence series’’ (CLIFS).