Doubly excited 1,3Pe meta-stable bound states and resonance states of helium in weakly coupled plasmas

摘要

The doubly excited 1,3Pe meta-stable bound states and resonance states of helium embedded in weakly coupled plasmas are calculated using Slater orbital basis functions. The plasma effects are taken care of by using the screened Coulomb potential obtained from the Debye model. We have calculated the 2pnp 1Pe (n = 3, 4) and 2pnp 3Pe (n = 2, 3, 4) meta-stable bound state energies of He in plasmas for various Debye lengths. In addition, a total of ten resonances (five each for 1Pe and 3Pe states) below the N = 3 He+ thresholds has also been obtained by calculating the density of states using a stabilization method. For the 1Pe states, this includes three members from the 3pnp (n = 4, 5, 6) series, and two members from the 3dnd (n = 4, 5) series. For the 3Pe state, this includes three members from the 3pnp (n = 3, 4, 5) series, and two members from the 3dnd (n = 3, 4) series. The resonance energies and widths for the 1,3Pe resonances for different screening parameters below the He+(3S) threshold are reported along with the eigen-energies of the 1,3Pe meta-stable bound states lying below the He+(2S) threshold.