Electron correlation in molecular many‐electron systems by diagrammatic many‐body perturbation theory: Correlation energies and dipole polarizabilities of the hydrogen molecule

1979 ◽  
Vol 70 (5) ◽  
pp. 2378-2389 ◽  
Author(s):  
T. Itagaki ◽  
A. Saika
Keyword(s):  
Perturbation Theory ◽  
Electron Correlation ◽  
Hydrogen Molecule ◽  
Electron Systems ◽  
Many Body ◽  
Many Body Perturbation Theory ◽  
Dipole Polarizabilities

ENERGY-DEPENDENT MANY-BODY PERTURBATION THEORY: A ROAD TOWARDS A MANY-BODY-QED PROCEDURE

2007 ◽  
Vol 16 (04) ◽  
pp. 1221-1231 ◽  
Author(s):  
INGVAR LINDGREN ◽  
STEN SALOMONSON ◽  
DANIEL HEDENDAHL
Keyword(s):  
Perturbation Theory ◽  
Electron Correlation ◽  
Numerical Evaluation ◽  
Arbitrary Order ◽  
Coulomb Interactions ◽  
Many Body ◽  
Many Body Perturbation Theory ◽  
Qed Effects ◽  
Energy Dependent ◽  
Rigorous Procedure

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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