The Calculation of the Rates of Intramolecular Nonradiative Transitions in Benzene
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概要
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Intramolecular nonradiative transition rates for various interstates of benzene were calculated from the standpoint of the breakdown of the Born-Oppenheimer approximation. The electronic parts of the coupling matrix elements were explicitly evaluated. These parts vary in the range of 10<SUP>−1</SUP>–10<SUP>−3</SUP> Å<SUP>−1</SUP>. The nonradiative transition rates for the <SUP>1</SUP><I>E</I><SUB>1<I>u</I></SUB>→<SUP>1</SUP><I>B</I><SUB>1<I>u</I></SUB>,<SUP>1</SUP><I>B</I><SUB>2<I>u</I></SUB> transitions were predicted to be appreciable. The rate for the <SUP>1</SUP><I>B</I><SUB>1<I>u</I></SUB>→<SUP>1</SUP><I>B</I><SUB>2<I>u</I></SUB> transition vanishes as long as the geometrical structure of the <SUP>1</SUP><I>B</I><SUB>1<I>u</I></SUB> state is assumed to be of the <I>D</I><SUB>6<I>h</I></SUB> symmetry. These results are compared with the experimental nonradiative transition widths recently reported by Jortner <I>et al</I>.
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