Complex-scaling calculations for resonance states of he with screened coulomb potentials

Abstract

The doubly excited 1Se, 1Po, and 1De resonance states of helium atom with screened Coulomb potentials are investigated. The complex scaling method with configuration interaction type basis functions are employed to extract the resonances associated with the He+(N = 2, 3, and 4) thresholds. 18 resonances (six below each of the He+ threshold) for each angular-momentum state are calculated. The results lying below the He+(N = 2) threshold are in good agreement with previous calculations by the stabilization method with correlated basis wave functions. The 1Po and 1De resonance states lying below the He+(N = 3 and 4) thresholds in the screening environment are reported for the first time. © 2013 Wiley Periodicals, Inc.