EOM/Propagator ionization potentials: Extension of the excitation operator manifold |
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Authors: | Jon Baker |
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Affiliation: | Department of Quantum Chemistry, Uppsala University, Box 518, S-751 20 Uppsala, Sweden |
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Abstract: | The excitation operator manifold required for the calculation of vertical IPs in the EOM/propagator formalism is extended to include products of five spin orbital field operators (refered to as the h5 basis). Spin symmetry adaptation is used for all the operators of this manifold. Using a direct diagonalization technique introduced previously the effect of inclusion of the h5 basis on calculated IPs is illustrated for various levels of approximation to the electron density by numerical applications to ethylene and water. The fourth-order terms thus introduced are shown to have greater magnitude than previously included third-order terms, in agreement with earlier work. |
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