... pair approximation (cepa) [25] , takes into account only the EPV part of the term V2{S a#39;2^2} of (50), where the same pair of the electrons are excited in the two S parts. ... The EPV part can be included by a modification of the energy denominator (31) associated with the diagram. This corresponds to the summation of certain aquot;ladderaquot; diagrams to infinite order, discussed by Kelly [26] . ... + UJA 3H UTV hk.

Title | : | Proceedings of the International Symposium on Atomic, Molecular, and Solid-State Theory, Collision Phenomena, and Computational Methods, held at Flagler Beach, Florida, March 12-18, 1978 |

Author | : | Per Olov Löwdin, Yngve Öhrn |

Publisher | : | John Wiley & Sons - 1978-01-01 |

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