Doubly excited P-wave resonance states of H- in Debye plasmas

We investigate the doubly excited P-wave resonance states of H- system in Debye plasmas modeled by static screened Coulomb potentials. The screening effects of the plasma environment on resonance parameters (energy and width) are investigated by employing the complex-scaling method with Hylleraas-type wave functions for both the shape and Feshbach resonances associated with the H(N=2 to 6) thresholds. Under the screening conditions, the H(N) threshold states are no longer l degenerate, and all the H- resonance energy levels are shifted away from their unscreened values toward the continuum. The influence of Debye plasmas on resonance widths has also been investigated. The shape resonance widths are broadened with increasing plasma screening strength, whereas the Feshbach resonance widths would generally decrease. Our results associated with the H(N=2) and H(N=3) thresholds are compared with others in the literature. (C) 2013 AIP Publishing LLC.