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Calculation of excitation and photoionization spectra by quasi-degenerate perturbation theory
Adriana Lisini,
Piero Decleva,
Adriana Lisini
Dipartimento di Scienze Chimiche, Universitá di Trieste, Via Licio Giorgieri 1, I-34127 Trieste, Italy
Search for more papers by this authorPiero Decleva
Dipartimento di Scienze Chimiche, Universitá di Trieste, Via Licio Giorgieri 1, I-34127 Trieste, Italy
Search for more papers by this authorAdriana Lisini,
Piero Decleva,
Adriana Lisini
Dipartimento di Scienze Chimiche, Universitá di Trieste, Via Licio Giorgieri 1, I-34127 Trieste, Italy
Search for more papers by this authorPiero Decleva
Dipartimento di Scienze Chimiche, Universitá di Trieste, Via Licio Giorgieri 1, I-34127 Trieste, Italy
Search for more papers by this authorFirst published: 5 October 1994
Abstract
The ability of the QDPT CI method, in which the quasi-degenerate perturbation theory is applied within the configuration interaction (CI) approach, in dealing with the calculation of excitation and photoionization spectra is shown through an overview of comparisons between the QDPT CI values and the full CI ones in the same basis set. A direct comparison with the experimental data is given for the core photoelectron spectrum of Ne and the valence photoelectron spectra of Ar and HCl. The quality of the results obtained is very satisfactory, both as regards the energies and the wave functions, indicating the validity and the flexibility of the method that can confidently be applied also in cases where strong correlation effects are present. © 1994 John Wiley & Sons, Inc.
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