Abstract
AbstractThe matrix elements of the correlation function between symmetric potential harmonics am simplified into the analytical summations of the grand angular momenta by dy using the recurrence and coupling relations of the potential harmonics. 'The correlation‐function potential‐harmonic and generalized‐Laguerre‐function method (CFPHGLF), recently developed by us, is applied to the S states of the helium‐like systems for Z = 2 to 9. The results exhibit good convergence with the bases in tern of both the angular and radial directions. The final eigen‐energies agree excellently with the best s‐limits of the variational configuration interaction (CI) method for the involved low‐lying S states. The accuracy of the potential harmonic (PH) expansion scheme is discussed relative to the exact Hylleraas CI results (HCI), and Hartree‐Fock results. Moreover, suggestion is given for the future improvement of the PH scheme.
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