Analytic energy gradients for the orbital-optimized third-order Møller–Plesset perturbation theory (OMP3) [U. Bozkaya, J. Chem. Phys. 135, 224103 (2011)]
https://doi.org/10.1063/1.3665134 are presented. The OMP3 method is applied to problematic chemical systems with challenging electronic structures. The performance of the OMP3 method is compared with those of canonical second-order Møller-Plesset perturbation theory (MP2), third-order Møller-Plesset perturbation theory (MP3), coupled-cluster singles and doubles (CCSD), and coupled-cluster singles and doubles with perturbative triples [CCSD(T)] for investigating equilibrium geometries, vibrational frequencies, and open-shell reaction energies. For bond lengths, the performance of OMP3 is in between those of MP3 and CCSD. For harmonic vibrational frequencies, the OMP3 method significantly eliminates the singularities arising from the abnormal response contributions observed for MP3 in case of symmetry-breaking problems, and provides noticeably improved vibrational frequencies for open-shell molecules. For open-shell reaction energies, OMP3 exhibits a better performance than MP3 and CCSD as in case of barrier heights and radical stabilization energies. As discussed in previous studies, the OMP3 method is several times faster than CCSD in energy computations. Further, in analytic gradient computations for the CCSD method one needs to solve λ-amplitude equations, however for OMP3 one does not since
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14 September 2013
Research Article|
September 13 2013
Analytic energy gradients for the orbital-optimized third-order Møller–Plesset perturbation theory
Uğur Bozkaya
Uğur Bozkaya
a)
Department of Chemistry,
Atatürk University
, Erzurum 25240, Turkey
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a)
Author to whom correspondence should be addressed. Electronic mail: ugur.bozkaya@atauni.edu.tr.
J. Chem. Phys. 139, 104116 (2013)
Article history
Received:
June 09 2013
Accepted:
August 26 2013
Citation
Uğur Bozkaya; Analytic energy gradients for the orbital-optimized third-order Møller–Plesset perturbation theory. J. Chem. Phys. 14 September 2013; 139 (10): 104116. https://doi.org/10.1063/1.4820877
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