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Volumn 120, Issue 17, 2004, Pages 7849-7860

A computational strategy for geometry optimization of ionic and covalent excited states, applied to butadiene and hexatriene [1]

Author keywords

[No Author keywords available]

Indexed keywords

BENCHMARKING; BUTADIENE; CORRELATION METHODS; EXCITONS; GEOMETRY; IONS; ISOMERS; MATHEMATICAL MODELS; OPTIMIZATION; PERTURBATION TECHNIQUES; POTENTIAL ENERGY; PROBLEM SOLVING; SPECTROSCOPIC ANALYSIS;

EID: 2442700390     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1690756     Document Type: Article
Times cited : (80)

References (93)
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    • note
    • 1 conical intersection in cis-butadiene (Fig. S2) and CASSCF active orbitals in trans-butadiene (Table S3). A direct link to this document may be found in the online article's HTML reference section. The document may also be reached via the EPAPS homepage (http://www.aip.org/ pubservs/epaps.html) or from ftp.aip.org in the directory /epaps/. See the EPAPS homepage for more information.
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    • note
    • 2 axis of the system is perpendicular to the molecular plane for the trans isomer whereas it is in plane for the cis isomer.
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    • note
    • Analytical energy gradients have recently been implemented for second-order multireference perturbation theory (MRPT2): P. Celani and H.-J. Werner, J. Chem. Phys. 119, 5044 (2003). However, in cases with strong valence-Rydberg mixing like butadiene and hexatriene, a multistate treatment is required, which allows a relaxation and mixing of the zeroth-order wave functions in the correlation treatment. MRPT2 analytical energy gradients are not yet implemented in such cases.


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