K V Sane
Articles written in Pramana – Journal of Physics
Volume 13 Issue 1 July 1979 pp 9-14 Quantum Mechanics
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.
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