Doubly excited 1Po resonance states of helium in quantum plasmas

Abstract

We have made an investigation on the doubly excited 1Po resonance states of helium atom in quantum plasmas using correlated exponential wave functions within the framework of the stabilization method. The effect of quantum plasma has been incorporated by using an exponential-cosine-screened Coulomb potential. A total of nine resonances for 1Po states below the He+(2s 2S) thresholds are calculated, including four members in the 2snp+ (2\u2009≤\u2009n\u2009≤\u20095) series, three members in the 2snp− (3\u2009≤\u2009n\u2009≤\u20095) series, and two members in the 2pnd (n\u2009=\u20093, 4) series. The resonance parameters (energies and widths) for various screening parameters for the 1Po resonance states of helium atom in quantum plasmas, are reported. In addition, the effect of quantum plasmas on the wavelengths for the photo-absorption of a helium atom from its ground state to such 1Po resonance states are also reported in terms of the screening parameter.