Effects of an external electric field onPo1resonances ofH

Abstract
Positions, widths, and oscillator strengths for the 2s2p "shape" resonance and the lowest Feshbach resonance in the Po1 spectrum of H have been computed via the method of complex coordinates. The dc Stark broadening of the shape resonance has been determined giving a quantitative estimate of the effects of plasma microfields on the resonance and explaining the negative observational results of Ott et al. [Phys. Rev. A 12, 2009 (1975)].