Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 124, Issue 7, Pages 1444-1463Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.9b11522
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Funding
- CSIR, India [01(2973)/19/EMR-II]
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An improved virtual orbital complete active space configuration interaction reference function-based multireference Brillouin-Wigner perturbation approach (IVO-BWMRPT) that avoids the numerical divergence because of the intruder problem by focusing on obtaining a single root of the many-body Hamiltonian is used to compute dissociation energy surfaces and spectroscopic constants of C-2, N-2, and CN radicals. For such correlated molecules, the computational demand to delineate the wavefunction exactly is quite challenging. The IVO-BWMRPT method, a convenient and effective way to handle quasidegenerate situations, accurately captures different correlations and is capable of treating the variation of multiconfigurational nature of wave functions that occur during the multiple-bond breaking processes. Spectroscopic constants extracted from the computed surface are in good agreement with experimental or benchmark results, indicating that the components of the IVO-BWMRPT scheme must perform in harmony for providing a well-behaved and consistent description of all computed bond lengths.
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