title: Correlation Energy Expressions from the Adiabatic-Connection Fluctuation-Dissipation Theorem Approach.
abstract: We explore several random phase approximation (RPA) correlation energy variants within the adiabatic-connection fluctuation-dissipation theorem approach. These variants differ in the way the exchange interactions are treated. One of these variants, named dRPA-II, is original to this work and closely resembles the second-order screened exchange (SOSEX) method. We discuss and clarify the connections among different RPA formulations. We derive the spin-adapted forms of all the variants for closed-shell systems and test them on a few atomic and molecular systems with and without range separation of the electron-electron interaction.
authors.affiliation: CRM2, Institut Jean Barriol, Nancy University and CNRS, 54506 Vandoeuvre-lès-Nancy, France.
authors.forename: János G
authors.initials: JG
authors.lastname: Ángyán
authors.affiliation: CRM2, Institut Jean Barriol, Nancy University and CNRS, 54506 Vandoeuvre-lès-Nancy, France.
authors.forename: Ru-Fen
authors.initials: RF
authors.lastname: Liu
authors.affiliation: Laboratoire de Chimie Théorique, Université Pierre et Marie Curie and CNRS, 75005 Paris, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Toulouse
authors.affiliation: Fakultät für Chemie, Universität Duisburg-Essen , 45117 Essen, Germany.
authors.forename: Georg
authors.initials: G
authors.lastname: Jansen