Abstract
We investigate the singly-excited and doubly-excited 1,3Po states of screened-heliumlike atoms (Z=3-10), starting from Li+ to Ne8+ under the influence of exponential cosine-screened (ECS) Coulomb potentials. Pseudo-random-parameters dependent correlated exponential wave functions are used to represent the correlation effects between the charged particles. The singly-excited 1s2p 1,3P states are also estimated based on the Ritz variational method. The doubly excited resonance energies and widths are determined using the stabilization method. A total of 9 P-wave resonances including four members in the 2snp+ (2 ≤n≤ 5) series, three members in the 2snp−(3 ≤n≤ 5) series, and two members in the 2pnd (n=3, 4) series for each screened-systems below the 2s 2S thresholds of the respective one-electron subsystems are reported. The singly-excited state energies for each system and each screening parameter below the n=1 thresholds of the respective subsystems are also reported. The singly-excited states of ECS-heliumlike systems (Z= 6–10) and the doubly-excited 1,3Po states of the ECS-heliumlike systems are presented for the first time in the literature.
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