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- W2078430908 abstract "Using the active-space two-electron reduced density matrix (2-RDM) method, which scales polynomially with the size of the active space [G. Gidofalvi and D. A. Mazziotti, J. Chem. Phys. 129, 134108 (2008)], we were able to use active spaces as large as 24 electrons in 24 orbitals in computing the ground-state energies and properties of highly multireferenced arynes. Because the conventional complete-active-space self-consistent-field (CASSCF) method scales exponentially with the size of the active space, its application to arynes was mainly limited to active spaces of 12 electrons in 12 orbitals. For these smaller active spaces the active-space 2-RDM method accurately reproduces the results of CASSCF. However, we show that the larger active spaces are necessary for describing changes in energies and properties with aryne chain length such as the emergence of polyradical character. Furthermore, the addition of further electron correlation by multireference perturbation theory is demonstrated to be inadequate for removing the limitations of the smaller active spaces." @default.
- W2078430908 created "2016-06-24" @default.
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- W2078430908 date "2009-05-08" @default.
- W2078430908 modified "2023-10-17" @default.
- W2078430908 title "Highly multireferenced arynes studied with large active spaces using two-electron reduced density matrices" @default.
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- W2078430908 doi "https://doi.org/10.1063/1.3127402" @default.
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