On the 5d 1Πg -&gt 2 1Σu+ and 5d 1Πg -&gt C 1Πu fluorescence in 7Li2

Following excitation of the 5d 1Πg Rydberg state of 7Li2 by optical-optical double resonance, fluorescence has been observed in the infrared region to the 2 1Σu+ and C 1Πu states. Analysis of high-resolution Fourier transform spectra yields term energies and rotational constants of the lowest seven vibrational levels of the inner well of the 2 1Σu+ 'double minimum' state. The equilibrium term value and dissociation energy have been determined to be Te = 30101.45 &plusmn 0.12 cm-1 and De = 5621.3 &plusmn 0.2 cm-1. The v = 0 and 1 levels of the C 1Πu state have been analyzed, resulting in new values of Te = 30551.0 &plusmn 0.1 cm-1 and De = 7773.3 &plusmn 0.2 cm-1.