Strongly correlated states in the Li- ion - art. no. 053409

A collinear laser-ion beam apparatus has been used to investigate resonance structure in the Li(3s) +e(-)(kp) partial photodetachnnent cross section b elow the Li(6p) threshold. A complex rotation calculation was used to ident ify the strongly correlated, doubly excited states of the quasi-two-electro n ion Li- that are responsible for the observed resonances. These represent the most highly excited states of Li- observed thus far. Several members o f a strong "+" type series were observed as well as at least one resonance with ''-" type character. In particular, we report on an observation of a r esonance that violates the Delta nu =0 propensity rule.