Problems in electron propagator calculations of the correlation energy |
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Authors: | M Jaszuński BT Pickup R McWeeny |
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Institution: | Department of Chemistry, The University, Sheffield, UK |
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Abstract: | Approximations to the one-electron propagator, G(ω), are discussed asa basis for correlation energy calculations. The random-phase approximation (RPA) and second-order perturbation theory estimates of the self-energy are used to determine G(ω). Correlation energy expressions, resulting from contour integration, are compared with the standard perturbation expansion. We suggest that some of the simpler approximations to the electron propagator may be unsuited to calculations of the correlation energy. |
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