PHOTODETACHMENT OF LI- FROM THE LI 3S THRESHOLD TO THE LI 6S THRESHOLD

Eigenchannel R-matrix calculations (including effects of long-range mu ltipole interactions beyond the reaction volume) for Li- photodetachme nt partial cross sections from the vicinity of the Li 3s threshold to the Li 6s threshold (3.8 eV less than or equal to (h) over bar omega l ess than or equal to 5.65 eV) are presented. Excellent agreement with the relative total cross section measurements of U. Berzinsh et al. [P hys. Rev. Lett. 74, 4795 (1995)] in the vicinity of the Li 3s and Li 3 p thresholds is found. The calculated resonance structures are analyze d in detail. In particular, the energy region between the Li 4s and Li 5p thresholds (for which there are as yet no experimental measurement s) is shown to have types of doubly excited resonances which are promi nent only because of the nonhydrogenic Li+ core; such types are weak o r absent in higher-energy regions as well as in H- photodetachment spe ctra.