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- W2040543790 abstract "Equation-of-motion coupled cluster with singles and doubles (EOM-CCSD) method has been applied to exciton states of polyethylene using ab initio crystal Hartree–Fock method with one-dimensional periodic boundary condition. Full transformation of two-electron integrals from atomic-orbital basis to crystal-orbital basis has been performed for EOM-CCSD calculations. In order to make transformed integrals to have correct properties of translational symmetry, a lattice summation scheme has been proposed. The EOM-CCSD excitation energies have been obtained for the lowest singlet and triplet exciton states of polyethylene. The excitation energies converge with system size much faster than oligomer calculations using n-alkanes. Quasiparticle energy-level calculations by second-order many-body perturbation theory and by solving the inverse Dyson equation have also been performed to obtain exciton binding energies. Basis set dependencies on excitation energy, quasiparticle band gap, and exciton binding energy have been investigated. At the 6-31+G level, the excitation energy of the lowest singlet-exciton state and its binding energy are calculated to be 8.1 and 3.2eV, respectively. The calculated excitation energy is well comparable with the corresponding experimental value, 7.6eV." @default.
- W2040543790 created "2016-06-24" @default.
- W2040543790 creator A5068171486 @default.
- W2040543790 date "2005-06-08" @default.
- W2040543790 modified "2023-09-27" @default.
- W2040543790 title "Equation-of-motion coupled-cluster study on exciton states of polyethylene with periodic boundary condition" @default.
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- W2040543790 doi "https://doi.org/10.1063/1.1929731" @default.
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