Kats, Danylo and Korona, Tatiana and Schuetz, Martin (2007) Transition strengths and first-order properties of excited states from local coupled cluster CC2 response theory with density fitting. JOURNAL OF CHEMICAL PHYSICS, 127 (6): 064107. ISSN 0021-9606,
Full text not available from this repository. (Request a copy)Abstract
A new ab initio method for calculating transition strengths and orbital-unrelaxed first-order properties of singlet ground and excited states of extended molecular systems is presented. It is based on coupled cluster response theory at the level of the CC2 model with local approximations introduced to the doubles-excitation part of the wave function. Density fitting is employed for the calculation of the electron repulsion integrals, so that-with the exception of doubles amplitudes-only three-indexed objects do occur in the formalism. The new method was tested by performing calculations for a set of various molecules and excited states and by comparing the results with corresponding canonical (nonlocal) calculations. It turned out that for calculating transition strengths and properties of excited states the ordinary Boughton-Pulay domains are insufficient in numerous cases. To circumvent this problem a new scheme for extending domains is proposed, which is based on the solution of the coupled perturbed localization and Hartree-Fock equations. When such extended domains are used, a satisfactory agreement between canonical and local results is achieved. (C) 2007 American Institute of Physics.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON CORRELATION METHODS; PLESSET PERTURBATION-THEORY; EXCITATION-ENERGIES; WAVE-FUNCTIONS; BASIS-SETS; IDENTITY APPROXIMATION; LARGE MOLECULES; DOUBLES MODEL; AB-INITIO; RESOLUTION; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Research Group Theoretical Chemistry > Prof. Dr. Martin Schütz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Dec 2020 14:10 |
| Last Modified: | 01 Dec 2020 14:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32389 |
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