A simple and efficient CCSD(T)-F12 approximation.

@article{Adler2007ASA,
  title={A simple and efficient CCSD(T)-F12 approximation.},
  author={Thomas B. Adler and Gerald Knizia and Hans-Joachim Werner},
  journal={The Journal of chemical physics},
  year={2007},
  volume={127 22},
  pages={
          221106
        }
}
A new explicitly correlated CCSD(T)-F12 approximation is presented and tested for 23 molecules and 15 chemical reactions. The F12 correction strongly improves the basis set convergence of correlation and reaction energies. Errors of the Hartree-Fock contributions are effectively removed by including MP2 single excitations into the auxiliary basis set. Using aug-cc-pVTZ basis sets the CCSD(T)-F12 calculations are more accurate and two orders of magnitude faster than standard CCSD(T)/aug-cc-pV5Z… CONTINUE READING
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