Abstract
AbstractThe dipole transition‐matrix elements (DTMEs) and oscillator strengths (OSs) for the doubly excited states (DESs) in heliumlike carbon are investigated using the correlated exponential wavefunctions (CEW). The interactions between the charged particles are taken care of by using both Coulomb and screened Coulomb (Debye–Hückel) potentials. The singly excited 1s3p1P state and doubly excited 2p2 1Destate are also calculated using CEW. The singly excited states of C4+in terms of Debye length (DL) are calculated using the Ritz variational principle. The DESs for different DLs are determined using the stabilization method. The DTMEs and OSs for the transitions between the 2p2 1Destate and the 1s2p1P, 1s3p1P, 2s2p+1Po, 2s3p−1Po, 2s3p+1Po, 2p3d1Postates, along with the 2p2 1Deresonance parameters are reported for various DLs. The benchmark data for DTMEs and OSs for the DESs in the C4+ion in pure Coulomb and screened Coulomb environments, obtained by employing highly CEW functions and utilizing the stabilization method, are reported for the first time.
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