1SNS RYDBERG STATES OF THE HE ATOM

We carried out the variational configuration interaction calculation to obtain the energies for n1S series in He for n = 7-16, and for n3S series in He for n = 14-18 with B-spline basis functions. As found in our previous report, the accuracy of our results does not deteriorate with increasing principal quantum number. The accuracy of our results is better than the previous best results calculated by Accad et al. We give lower variational energies than Accad et al for n1S states (n greater-than-or-equal-to 10) and n3S states (n greater-than-or-equal-to 15). We also calculated the radial expectation values, the mass-polarization effect, and the expectation values of delta(r1) and delta(r12), which have not been calculated before, They can give some indication of the accuracy of the high-lying Rydberg-state wavefunctions.