Excited-state geometries and electronic spectra of butadiene, acrolein, and glyoxal have been investigated by the symmetry adapted cluster configuration interaction (SAC-CI) method in their s-trans conformation. Valence and Rydberg states below the ionization threshold have been precisely calculated with sufficiently flexible basis sets. Vertical and adiabatic excitation energies were well reproduced and the detailed assignments were given taking account of the second moments. The deviations of the vertical excitation energies from the experiment were less than for all cases. The SAC-CI geometry optimization has been applied to some valence and Rydberg excited states of these molecules in the planar structure. The optimized ground- and excited-state geometries agree well with the available experimental values; deviations lie within and 0.7° for the bond lengths and angles, respectively. The force acting on the nuclei caused by the excitations has been discussed in detail by calculating the SAC-CI electron density difference between the ground and excited states; the geometry relaxation was well interpreted with the electrostatic force theory. In Rydberg excitations, geometry changes were also noticed. Doubly excited states (so-called states) were investigated by the SAC-CI general- method considering up to quadruple excitations. The characteristic geometrical changes and large energetic relaxations were predicted for these states.
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7 July 2006
Research Article|
July 07 2006
Singly and doubly excited states of butadiene, acrolein, and glyoxal: Geometries and electronic spectra
Biswajit Saha;
Biswajit Saha
Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering,
Kyoto University
, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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Masahiro Ehara;
Masahiro Ehara
a)
Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering,
Kyoto University
, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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Hiroshi Nakatsuji
Hiroshi Nakatsuji
a)
Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering,
Kyoto University
, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan and Fukui Institute for Fundamental Chemistry, Kyoto University
, 34-4 Takano Nishihirakicho, Sakyo-ku, Kyoto 606-8103, Japan
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a)
Authors to whom correspondence should be addressed. Electronic mails: ehara@sbchem.kyoto-u.ac.jp and hiroshi@sbchem.kyoto-u.ac.jp
J. Chem. Phys. 125, 014316 (2006)
Article history
Received:
November 18 2005
Accepted:
April 04 2006
Citation
Biswajit Saha, Masahiro Ehara, Hiroshi Nakatsuji; Singly and doubly excited states of butadiene, acrolein, and glyoxal: Geometries and electronic spectra. J. Chem. Phys. 7 July 2006; 125 (1): 014316. https://doi.org/10.1063/1.2200344
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