A spin adapted configuration interaction scheme is proposed for the evaluation of ionization potentials in α high spin open shell reference functions. There are three different ways to remove an electron from such a reference, including the removal of an alpha or a beta electron from doubly occupied or an alpha electron from singly occupied molecular orbitals. Ionization operators are constructed for each of these cases, and the resulting second quantized expressions are implemented using an automated code generator environment. To achieve greater computational efficiency, the virtual space is reduced using an averaged pair natural orbital machinery developed earlier and applied with great success in the calculation of X-ray absorption spectra [D. Manganas et al., J. Chem. Phys. A 122, 1215 (2018)]. Various approximate integral evaluation schemes including the resolution of identity and seminumerical techniques are also invoked to further enhance the computational efficiency. Although the resulting method is not particularly accurate in terms of predicting absolute energy values, with a simple shift in the ionization potentials, it is still possible to use it for the qualitative characterization of the basic features of X-ray photoionization spectra. While satellite intensities cannot be computed with the current method, the inclusion of vibrational effects using a path integral technique allows for the computation of vibrational transitions corresponding to main peaks.
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21 September 2018
Research Article|
September 21 2018
An efficient pair natural orbital based configuration interaction scheme for the calculation of open-shell ionization potentials
Avijit Sen
;
Avijit Sen
1
Max-Planck-Institut für Kohlenforschung
, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
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Bernardo de Souza;
Bernardo de Souza
2
Max-Planck-Institute for Chemical Energy Conversion
, Mülheim an der Ruhr, Germany
3
Universidade Federal de Santa Catarina
, Florianópolis, Brazil
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Lee M. J. Huntington
;
Lee M. J. Huntington
2
Max-Planck-Institute for Chemical Energy Conversion
, Mülheim an der Ruhr, Germany
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Martin Krupička
;
Martin Krupička
2
Max-Planck-Institute for Chemical Energy Conversion
, Mülheim an der Ruhr, Germany
4
University of Chemistry and Technology
, Prague, Czech Republic
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Frank Neese;
Frank Neese
a)
1
Max-Planck-Institut für Kohlenforschung
, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
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Róbert Izsák
Róbert Izsák
b)
1
Max-Planck-Institut für Kohlenforschung
, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
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a)
Electronic mail: [email protected]
b)
Electronic mail: [email protected]
J. Chem. Phys. 149, 114108 (2018)
Article history
Received:
July 17 2018
Accepted:
September 07 2018
Citation
Avijit Sen, Bernardo de Souza, Lee M. J. Huntington, Martin Krupička, Frank Neese, Róbert Izsák; An efficient pair natural orbital based configuration interaction scheme for the calculation of open-shell ionization potentials. J. Chem. Phys. 21 September 2018; 149 (11): 114108. https://doi.org/10.1063/1.5048688
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