On the summation of the Brillouin-Wigner type perturbation series |
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| Authors: | K V Sane R P Saxena P K Srivastava |
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| Institution: | (1) Department of Chemistry, University of Delhi, 110 007 Delhi;(2) Department of Physics, University of Delhi, 110 007 Delhi |
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| Abstract: | 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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| Keywords: | Brillouin-Wigner series mean excitation energy approximation correlated trial function helium atom |
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