Analytic evaluation of energy gradients for the single and double excitation coupled cluster (CCSD) wave function: Theory and application. Scheiner, A. C., Scuseria, G. E., Rice, J. E., Lee, T. J., & Schaefer, H. F. The Journal of Chemical Physics, 87(9):5361–5373, 1987. doi abstract bibtex The theory for the analytic evaluation of energy gradients for coupled cluster (CC) wave functions is presented. In particular, explicit expressions for the analytic energy gradient of the CC singles and doubles (CCSD) wave function for a closed-shell restricted Hartree-Fock reference determinant are presented and shown to scale as N6 where N is the one-electron number of one-electron basis functions for the molecular system. Thus analytic CCSD gradients are found to be of the same magnitude in computational cost as is the evaluation of analytic gradients for the configuration interaction singles and doubles (CISD) wave function. Applications of this method are presented for the water molecule and the formaldehyde molecule using a double-$\zeta$ plus polarization (DZ + P) basis set. The CCSD equilibrium geometries, dipole moments, and, via finite differences of gradients, CCSD harmonic vibrational frequencies and infrared intensities are reported. For H2O these results are compared to analogous CISD, CISDT, CISDTQ, and experimental results, and it is found that the CCSD predictions are most comparable to those of CISDTQ for this particular system. For the case of H2CO, the CCSD results are compared to CISD and experimental predictions. In general, the CCSD results and timings are encouraging. \textcopyright 1987 American Institute of Physics.
@article{Scheiner1987,
abstract = {The theory for the analytic evaluation of energy gradients for coupled cluster (CC) wave functions is presented. In particular, explicit expressions for the analytic energy gradient of the CC singles and doubles (CCSD) wave function for a closed-shell restricted Hartree-Fock reference determinant are presented and shown to scale as N6 where N is the one-electron number of one-electron basis functions for the molecular system. Thus analytic CCSD gradients are found to be of the same magnitude in computational cost as is the evaluation of analytic gradients for the configuration interaction singles and doubles (CISD) wave function. Applications of this method are presented for the water molecule and the formaldehyde molecule using a double-$\zeta$ plus polarization (DZ + P) basis set. The CCSD equilibrium geometries, dipole moments, and, via finite differences of gradients, CCSD harmonic vibrational frequencies and infrared intensities are reported. For H2O these results are compared to analogous CISD, CISDT, CISDTQ, and experimental results, and it is found that the CCSD predictions are most comparable to those of CISDTQ for this particular system. For the case of H2CO, the CCSD results are compared to CISD and experimental predictions. In general, the CCSD results and timings are encouraging. {\textcopyright} 1987 American Institute of Physics.},
author = {Scheiner, Andrew C. and Scuseria, Gustavo E. and Rice, Julia E. and Lee, Timothy J. and Schaefer, Henry F.},
doi = {10.1063/1.453655},
issn = {00219606},
journal = {The Journal of Chemical Physics},
number = {9},
pages = {5361--5373},
title = {{Analytic evaluation of energy gradients for the single and double excitation coupled cluster (CCSD) wave function: Theory and application}},
volume = {87},
year = {1987}
}
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Applications of this method are presented for the water molecule and the formaldehyde molecule using a double-$\\zeta$ plus polarization (DZ + P) basis set. The CCSD equilibrium geometries, dipole moments, and, via finite differences of gradients, CCSD harmonic vibrational frequencies and infrared intensities are reported. For H2O these results are compared to analogous CISD, CISDT, CISDTQ, and experimental results, and it is found that the CCSD predictions are most comparable to those of CISDTQ for this particular system. For the case of H2CO, the CCSD results are compared to CISD and experimental predictions. 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