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Method of moments for the continuous transition between the Brillouin-Wigner-type and Rayleigh-Schroumldinger-type multireference coupled cluster theories

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    0326231 - ÚFCH JH 2010 RIV GB eng J - Journal Article
    Pittner, Jiří - Piecuch, P.
    Method of moments for the continuous transition between the Brillouin-Wigner-type and Rayleigh-Schroumldinger-type multireference coupled cluster theories.
    [Metoda momentu pro spojity prechod mezi MRCC metodami Brillouin-Wignerova a Rayleigh-Schroedingerova typu.]
    Molecular Physics. Roč. 107, 8-12 (2009), s. 1209-1221. ISSN 0026-8976. E-ISSN 1362-3028
    R&D Projects: GA ČR GA203/07/0070; GA AV ČR 1ET400400413; GA AV ČR KSK4040110
    Institutional research plan: CEZ:AV0Z40400503
    Keywords : multireference coupled cluster theory * method of moments of coupled cluster equations * state-universal multireference coupled cluster approach
    Subject RIV: CF - Physical ; Theoretical Chemistry
    Impact factor: 1.634, year: 2009

    We apply the method of moments to the multireference (MR) coupled cluster (CC) formalism representing the continuous transition between the Brillouin-Wigner-type and Rayleigh-Schroumldinger-type theories based on the Jeziorski-Monkhorst wave function ansatz and derive the formula for the noniterative energy corrections to the corresponding MRCC energies that recover the exact, full configuration interaction energies in the general model space case, including complete and incomplete model spaces. We also extend the relationship between the generalised moments of the state-universal (SU) MRCC equations within the Jeziorski-Monkhorst and Kucharski-Bartlett formulations of the SUMRCC theory to the general model space case. Finally, we argue that in the complete model space case, the relationship between moments of the SUMRCC equations corresponding to the Jeziorski-Monkhorst and Kucharski-Bartlett formulations of the SUMRCC theory, derived in this work...

    Aplikujeme metodu momentu na multireferenční coupled cluster formalismus reprezentující spojitý přechod mezi CC metodami Brillouin-Wignerova a Rayleigh-Schroedingerova typu založenými na Jeziorskiho-Monkhorstově tvaru vlnové funkce a odvozujeme vzorec pro neiterativní korekci MRCC energie, která je schopna vyčíslit přesnou energii úplně konfigurační interakce v případě obecného modelového prostoru (zahrnujícího úplné i neúplné prostory). Rovněž rozšiřujeme vztahy mezi zobecněnými momenty stavově-univerzálních MRCC rovnic pro Jeziorski-Monkhorstovu a Kucharski-Bartlettovu formulaci SUMRCC teorie pro obecný modelový prostor. Nakonec ukazujeme, že v úplném modelovém prostoru tyto vztahy implikují ekvivalenci těchto dvou formulací MRCC, pokud jsou v Kucharski-Bartlettově formulaci ponechány disconnected linked členy, a verifikujeme toto tvrzení i numericky.
    Permanent Link: http://hdl.handle.net/11104/0173395

     
     
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