Electron correlation effects on the structure of all 3dn4sm valence states of Ti, V, and Cr and their ions as studied by quasidegenerate many‐body perturbation theory

1982 ◽  
Vol 77 (4) ◽  
pp. 1984-2001 ◽  
Author(s):  
Yoon S. Lee ◽  
Karl F. Freed
2007 ◽  
Vol 16 (04) ◽  
pp. 1221-1231 ◽  
Author(s):  
INGVAR LINDGREN ◽  
STEN SALOMONSON ◽  
DANIEL HEDENDAHL

A rigorous procedure for energy-dependent many-body perturbation theory (MBPT) is presented. This can be applied for numerical evaluation of many-body-QED effects by combining QED with electron correlation to arbitrary order. So far, it has been used only for the exchange of a single retarded photon together with an arbitrary number of instantaneous Coulomb interactions. For heliumlike neon this represents more than 99% of the nonradiative effect on the energy beyond standard MBPT.


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