Abstract
The Rydberg states of benzene arising from excitations from the highest-occupied π orbital to s-, p-, and d-type orbitals are treated theoretically. All electrons are included and the calculated states satisfy the energy variational theorem. Calculations are essentially SCF calculations with the only multideterminant interactions being those required to treat the multiplet splitting. The treatment is kept simple by extracting all exchange integral information from SCF calculations using different input fields. The calculated energy spectrum is in good agreement with extensive experimental data for the singlet series up to n = 5 states. Predictions are made for the triplet series.
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