A Density-Based Basis-Set Correction for Wave Function Theory - Université Toulouse 3
Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2019

A Density-Based Basis-Set Correction for Wave Function Theory

Résumé

Similar to other electron correlation methods, manybody perturbation theory methods based on Green functions, such as the so-called GW approximation, suffer from the usual slow convergence of energetic properties with respect to the size of the one-electron basis set. This displeasing feature is due to the lack of explicit electron-electron terms modeling the infamous Kato electron-electron cusp and the correlation Coulomb hole around it. Here, we propose a computationally efficient density-based basis-set correction based on short-range correlation density functionals which significantly speeds up the convergence of energetics towards the complete basis set limit. The performance of this density-based correction is illustrated by computing the ionization potentials of the twenty smallest atoms and molecules of the GW100 test set at the perturbative GW (or G 0 W 0) level using increasingly large basis sets. We also compute the ionization potentials of the five canonical nucleobases (adenine, cytosine, thymine, guanine, and uracil) and show that, here again, a significant improvement is obtained.
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Dates et versions

hal-02153216 , version 1 (17-09-2024)

Identifiants

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Pierre-François Loos, Barthélémy Pradines, Anthony Scemama, Julien Toulouse, Emmanuel Giner. A Density-Based Basis-Set Correction for Wave Function Theory. Journal of Physical Chemistry Letters, 2019, 10 (11), pp.2931-2937. ⟨10.1021/acs.jpclett.9b01176⟩. ⟨hal-02153216⟩
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