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Brillouin-Wigner series; mean excitation energy approximation; correlated trial function; helium atom

It is shown that if the ‘mean excitation energy’ assumption is introduced in the Brillouin-Wigner perturbation series, then the resulting series can be exactly summed. The implications of the result for calculating energy shift and for constructing trial functions are examined with special reference to the ground state of the helium atom.

K V Sane¹ R P Saxena^{1 2} P K Srivastava^{1 2}

1. Department of Chemistry, University of Delhi, Delhi - 110 007
2. Department of Physics, University of Delhi, Delhi - 110 007

Published

July 1979

Manuscript received

24 March 1979