Abstract
Line shifts of rovibrational levels of the state of the b 3Π u state of Li 2 caused by rotational coupling to the a 3Σ u + state have been determined both theoretically and experimentally. Calculated and empirical unshifted term values of the b 3Π u state are found to be in excellent agreement. The calculated line shifts show the expected oscillatory structure and agree with the experimental data. Using the shifted b 3Π u energy levels and applying a minor modification to the ab initio a 3Σ u + potential curve as indicated by comparison with experimental line widths, theoretical accidental predissociation lifetimes of the Li 2 A 1Σ u + state are obtained in almost perfect agreement with the measured values.
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