Time-dependent optimized coupled-cluster method for multielectron dynamics. II. A coupled electron-pair approximation.

@article{Pathak2020TimedependentOC,
  title={Time-dependent optimized coupled-cluster method for multielectron dynamics. II. A coupled electron-pair approximation.},
  author={Himadri Pathak and Takeshi Sato and Kenichi L. Ishikawa},
  journal={The Journal of chemical physics},
  year={2020},
  volume={152 12},
  pages={
          124115
        }
}
We report the implementation of a cost-effective approximation method within the framework of the time-dependent optimized coupled-cluster (TD-OCC) method [T. Sato et al., J. Chem. Phys. 148, 051101 (2018)] for real-time simulations of intense laser-driven multielectron dynamics. The method, designated as TD-OCEPA0, is a time-dependent extension of the simplest version of the coupled-electron pair approximation with optimized orbitals [U. Bozkaya and C. D. Sherrill, J. Chem. Phys. 139, 054104… 

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