MAP: An MP2 Accuracy Predictor for Weak Interactions from Adiabatic Connection Theory

Stefan Vuckovic, Eduardo Fabiano, Paola Gori-Giorgi, Kieron Burke

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Abstract

Second-order Møller-Plesset perturbation theory (MP2) approximates the exact Hartree-Fock (HF) adiabatic connection (AC) curve by a straight line. Thus, by using the deviation of the exact curve from the linear behavior, we construct an indicator for the accuracy of MP2. We then use an interpolation along the HF AC to transform the exact form of our indicator into a highly practical MP2 accuracy predictor (MAP) that comes at a negligible additional computational cost. We show that this indicator is already applicable to systems that dissociate into fragments with a nondegenerate ground state, and we illustrate its usefulness by applying it to the S22 and S66 datasets.

Original languageEnglish
Pages (from-to)4141-4149
Number of pages9
JournalJournal of chemical theory and computation
Volume16
Issue number7
Early online date7 May 2020
DOIs
Publication statusPublished - 14 Jul 2020

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