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• W1969137464 abstract "We present a method that uses the one-particle density matrix to generate directly localized orbitals dedicated to multireference wave functions. On one hand, it is shown that the definition of local orbitals making possible physically justified truncations of the CAS (complete active space) is particularly adequate for the treatment of multireference problems. On the other hand, as it will be shown in the case of bond breaking, the control of the spatial location of the active orbitals may permit description of the desired physics with a smaller number of active orbitals than when starting from canonical molecular orbitals. The subsequent calculation of the dynamical correlation energy can be achieved with a lower computational effort either due to this reduction of the active space, or by truncation of the CAS to a shorter set of references. The ground- and excited-state energies are very close to the current complete active space self-consistent field ones and several examples of multireference singles and doubles calculations illustrate the interest of the procedure." @default.
• W1969137464 created "2016-06-24" @default.
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• W1969137464 date "2002-05-30" @default.
• W1969137464 modified "2023-10-16" @default.
• W1969137464 title "Direct generation of local orbitals for multireference treatment and subsequent uses for the calculation of the correlation energy" @default.
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• W1969137464 doi "https://doi.org/10.1063/1.1476312" @default.
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