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JOHN F. STANTON, Department of Chemistry & Biochemistry, The University of Texas at Austin, 1 University Station A5300 Austin, TX 78712.
Recent developments in vibronic coupling theory and quantum chemistry now allow the parametrization of vibronic Hamiltonians that are capable of achieving semi-quantitative agreement with experimental energy levels for strongly coupled systems. First applied to the HCO2 and BNB radicals, this sophisticated parametrization has been used for the nitrate radical. Results of calculations bearing on both all electronic states of NO3 below 2 eV will be presented.