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  • "Cílem tohoto projektu je formulovat a implementovat stavově specifickou multireferenční Brillouin-Wignerovu coupled cluster metodu se zahrnutím triexcitací, a to ve formě vhodné pro ""rutinní"" aplikace běžným uživatelem kvantově chemických programů. Následně chceme tuto techniku aplikovat na systémy, kde je zapotřebí velmi přesně zahrnout statickou i dynamickou korelaci. Vývoj analogické metody smono- a biexcitacemi byl již předmětem našeho výzkumu: metoda funguje spolehlivě a dovoluje popsat systéme, kde jednoreferenční přístup selhává, ale pokud chceme dosáhnout kvantitativní přesnost, je třeba zahrnout vliv teiexcitací alespoň aproximativně. Plánujeme vyvinout jak přesnou iterativní metody s triexcitacemi, tak i výpočetně méně náročné aproximace. Metodu hodláme otestovat pomocí výpočtů spektroskopických konstant diatomické molekuly a pak ji aplikovat i na větší systémy." (cs)
  • The aim of this project is to formulate and implement the state specific mulltireference Brillouin-Wigner coupled cluster method with triexcitations, in a form suitable for routine applications by an average user of quantum chemical programs. Subsequently we would like to apply the method to systems, which require a very exact treatment of both static and dynamic correlation. Development of an analogous method with mono and bioexcitations has been subject of our research in the past: the method is reliable and allows to treat systems for which the single reference methods fail, however, in order to achieve a quantitative accuracy, it is neccessary to include the effect of triple excitations, at least in an approximate way. We plan to develop the full iterative method with triple excitations as well as less computationally demanding approximations. We would like to test the method by calculations of spectroscopic constants of biatomic molecules and then apply it to larger systems. (en)
Title
  • State specific multireference Brillouin-Wigner coupled cluster method with triexcitations (en)
  • Stavově specifická multireferenční Brillouin-Wignerova coupled cluster metoda s triexcitacemi (cs)
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  • coupled cluster; multireference method; static correlation; Brillouin-Wigner perturbation theory (en)
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