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Phys. Rev. A 73, 012510 (2006) [5 pages]Proposal for a modified Møller-Plesset perturbation theory
Received 2 June 2005; published 23 January 2006
A modified version of the Møller-Plesset approach for obtaining the correlation energy associated with a Hartree-Fock ground state is proposed. The method is tested in a model of interacting fermions that allows for an exact solution. Using up to third order terms improved results are obtained, even in the limit of loosely bound particles. Tested in molecules as well, the modified method appears to give improved results in symmetric systems. ©2006 The American Physical Society
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