Abstract
The non-empirical SCF-LCAO-π-electron method previously developed for closed-shell molecules is extended to treat open-shell hydrocarbon systems. It is shown that the use of the Roothaan formalism, with configuration interaction involving all singly excited states, leads to a satisfactory description of the doublet state excitation energies and of the spin density distributions. Comparison of the total π-electronic energies with values relating to the corresponding closed-shell systems yields ionisation potentials in good agreement with experimental data.
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