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Towards the multireference Brillouin-Wigner coupled-clusters method with iterative connected triples: MR BWCCSDT-alpha approximation

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F05%3A00000665" target="_blank" >RIV/61388955:_____/05:00000665 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Towards the multireference Brillouin-Wigner coupled-clusters method with iterative connected triples: MR BWCCSDT-alpha approximation

  • Original language description

    We developed and implemented an approximation of the state-specific Brillouin-Wigner coupled-cluster method with singles, doubles, and triples, called MRBWCCSDT-alpha, for a general number of closed- and open-shell reference configurations. The accuracyof the method is assessed on the calculation of the oxygen molecule in the X3.SIGMA.g-, a1.DELTA.g, and b1.SIGMA.g+ states and the results of this multireference treatment are compared with previous MRBWCCSD results and with those obtained by the doublyionized similarity transformed equation-of-motion CCSD and multireference configuration interaction methods and with experimental spectroscopic data. Explicit tests of the size-extensivity of the MRBWCCSDT-alpha method with iterative size-extensivity correction are also performed.

  • Czech name

    Cesta k multireferenční stavové specifické Brillouinově -Wignerově metodě vázaných klastrů s mono- bi- a tri-excitacemi: MR BWCCSDT-alfa aproximace

  • Czech description

    Vyvinuli a implementovali jsme aproximaci k stavové specifické Brillouinově ?Wignerově metodě vázaných klastrů s mono- bi- a tri-excitacemi, nazvanou MR BWCCSDT-alfa, pro obecný počet referenčních konfigurací a ve formalismu otevřených i uzavřených slupek. Přesnost metody byla testována na výpočtech tří nízkoležících elektronických stavů molekuly kyslíku. Výsledky byly porovnány s dřívějšími hodnotami získanými MR BWCCSD, EOM-CCSD, MR CI a experimentálními hodnotami. Dále byly provedeny testy na size-extenzivitu metody MR BWCCSDT.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CF - Physical chemistry and theoretical chemistry

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/IAA4040401" target="_blank" >IAA4040401: State specific multireference Brillouin-Wigner coupled cluster method with triexcitations</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2005

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Chemical Physics

  • ISSN

    0021-9606

  • e-ISSN

  • Volume of the periodical

    122

  • Issue of the periodical within the volume

    18

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    6

  • Pages from-to

    181101-181106

  • UT code for WoS article

  • EID of the result in the Scopus database