Abstract
The results of a nonresonant near infrared two-photon laser spectroscopic study of the 2 1Σ+g state of 7Li2 are presented. Over 1000 rotationaly resolved 2 1Σ+g←X 1Σ+g transitions spanning 2300 cm−1 of the 2 1Σ+g potential well have been assigned and analyzed. Data from the v′=1 to v′=21 vibrational levels are used to obtain 2 1Σ+g state Dunham molecular constants as well as band-by-band constants. These data are also used to construct a Rydberg–Klein–Rees (RKR) potential which corresponds to 89% of the potential well depth. The results for the lower v′ levels are in agreement with the previously determined molecular constants for v′=0 to v′=16 [J. Mol. Spectrosc. 116, 271 (1986)]. For the higher v′ levels they reveal the perturbations from the 1 1Πg state. Comparisons with the results of ab initio calculations are made. In the 2 1Σ+g←X 1Σ+g nonresonant two-photon excitation only Q-branch transitions are observed with plane polarized radiation.
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