Department of Physics and Astronomy: Publications and Other Research
Date of this Version
December 1998
Abstract
Larger scale eigenchannel R-matrix calculations than those of Pan et al. [Phys. Rev. A53, 840 (1996)] confirm the prediction of a 2-meV-wide resonance feature at a photon energy of 5.421 eV in the Li (3s) partial cross section resulting from photodetachment of Li-. This resonance was neither clearly observed nor identified in measurements of Ljungblad et al. [Phys. Rev. Lett. 77, 3751 (1996)]. We identify this resonance as a N{υ}nA=5{1}6- state [having angular symmetry (K,T)A=(2,0) - or (n λ,nμ,m)=(1,7,0)]. This state, which is forbidden by propensity rules in H- photodetachment, is predicted to be prominent also in the Li(4l) partial cross sections, for l>~1. Besides the 5{1}6- state, the Li(3s) partial cross section in the energy region 20–60 meV below the Li(5p) threshold is dominated by two other doubly excited states, which have been observed in H- photodetachment. Our calculations are in excellent agreement with the measurements of Ljungblad et al. in the energy region from the Li(5p) threshold to 20 meV below.
Comments
Published by American Physical Society. Phys. Rev. A 58, 4997 (1998). http://pra.aps.org. Copyright © 1998 American Physical Society. Permission to use.