Assignment of electronic transitions by geometry optimization |
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Authors: | P C Mishra Karl Jug |
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Institution: | 1. Theoretische Chemie, Universit?t Hannover, Callinstrasse 3A, D-3000, Hannover 1, Germany
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Abstract: | Adiabatic excitation energies, excited state geometries, excited state charges, bond orders and dipole moments have been obtained
for HCN, CO2,H2CO, HFCO, F2CO, ethylene, trans-butadiene, furan, pyrrole and uracil using the SINDO1 semi-empirical method with configuration interaction.
Our results generally agree with those ofab initio calculations and experiment satisfactorily. Geometry optimization is found to mix configurations differing in their allowedness
in vertical excitation from the ground state, which in turn helps in the assignment of spectral transitions. TheV excited singlet state of trans-butadiene and various excited states of furan, pyrrole and uracil have been found to be appreciably
non-planar. The single and double CC bonds are found to exchange positions due to the lowest triplet and singlet transitions
of furan and pyrrole. The first triplet and first singlet transitions of uracil have been found to be of π-π* and π-σ* types
respectively in agreement with recent experimental findings.
On leave of absence from the Department of Physics, Banaras Hindu University, Varanasi-221005, India |
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Keywords: | Assignment of electronic transitions Excited state geometry optimization |
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