Relativistic Internally Contracted Multireference Electron Correlation Methods

Toru Shiozaki, Wataru Mizukami

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    We report internally contracted relativistic multireference configuration interaction (ic-MRCI), complete active space second-order perturbation (CASPT2), and strongly contracted n-electron valence state perturbation theory (NEVPT2) on the basis of the four-component Dirac Hamiltonian, enabling accurate simulations of relativistic, quasi-degenerate electronic structure of molecules containing transition-metal and heavy elements. Our derivation and implementation of ic-MRCI and CASPT2 are based on an automatic code generator that translates second-quantized ansätze to tensor-based equations, and to efficient computer code. NEVPT2 is derived and implemented manually. The rovibrational transition energies and absorption spectra of HI and TlH are presented to demonstrate the accuracy of these methods.

    Original languageEnglish
    Pages (from-to)4733-4739
    Number of pages7
    JournalJournal of Chemical Theory and Computation
    Volume11
    Issue number10
    DOIs
    Publication statusPublished - Sep 14 2015

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    Hamiltonians
    Electron correlations
    Correlation methods
    Electron transitions
    Heavy Metals
    Chemical elements
    configuration interaction
    Electronic structure
    Transition metals
    Tensors
    Absorption spectra
    Molecules
    Electrons
    heavy elements
    energy spectra
    electrons
    generators
    derivation
    perturbation theory
    transition metals

    All Science Journal Classification (ASJC) codes

    • Computer Science Applications
    • Physical and Theoretical Chemistry

    Cite this

    Relativistic Internally Contracted Multireference Electron Correlation Methods. / Shiozaki, Toru; Mizukami, Wataru.

    In: Journal of Chemical Theory and Computation, Vol. 11, No. 10, 14.09.2015, p. 4733-4739.

    Research output: Contribution to journalArticle

    Shiozaki, Toru ; Mizukami, Wataru. / Relativistic Internally Contracted Multireference Electron Correlation Methods. In: Journal of Chemical Theory and Computation. 2015 ; Vol. 11, No. 10. pp. 4733-4739.
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