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Influence of the choice of projection manifolds in the CASPT2 implementation
Inst Mol Sci, Dept Theoret & Computat Mol Sci, Okazaki, Aichi, Japan.;Grad Univ Adv Studies, Sch Phys Sci, Dept Funct Mol Sci, Okazaki, Aichi, Japan..
Kobe Univ, Grad Sch Syst Informat, Kobe, Hyogo, Japan.;PRESTO, Japan Sci & Technol Agcy, Kawaguchi, Saitama, Japan.;Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto, Japan..
Grad Univ Adv Studies, Sch Phys Sci, Dept Funct Mol Sci, Okazaki, Aichi, Japan.;Max Planck Inst Chem Energiekonvers, Stiftstr 34-36, D-45470 Mulheim, Germany..
Acad Sci Czech Republ, Inst Organ Chem & Biochem, Prague, Czech Republic..
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2017 (English)In: Molecular Physics, ISSN 0026-8976, E-ISSN 1362-3028, Vol. 115, no 17-18, 2077-2085 p.Article in journal (Refereed) Published
Abstract [en]

The Complete Active Space Second-Order Perturbation Theory (CASPT2) is well-established as a high-accuracy electronic structure method. It was originally implemented in the early 1990s to an efficient computer code in the molcas program suite, and this implementation has been extensively used as a standard tool. Here, we report a comparison of it against two independent computer-aided implementations of the CASPT2 method, revealing that the CASPT2 energies provided by the original code of molcas (version 8 or earlier) are inconsistent with the predictions of the lately developed computer-aided implementations. It is shown that this error is associated with the projections of the first-order equation onto the fully internally contracted multireference bases which are partially inconsistent between the left- and right-hand sides. The degree of the errors is assessed by performing illustrative CASPT2 calculations. The errors in total CASPT2 energies are demonstrated to be negligible relative to chemical accuracy in many cases, while there is a difficult case where they may substantially alter chemical description. The incorporation of the consistent projections into molcas has been carried out, which is available in the version 8 sp1.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2017. Vol. 115, no 17-18, 2077-2085 p.
Keyword [en]
Multireference theory, CASPT2, MOLCAS, computer-aided programming
National Category
Theoretical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-334508DOI: 10.1080/00268976.2016.1271152ISI: 000408727700010OAI: oai:DiVA.org:uu-334508DiVA: diva2:1166075
Available from: 2017-12-14 Created: 2017-12-14 Last updated: 2017-12-14Bibliographically approved

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Lindh, Roland

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