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>Sublevel phosphorescence spectra of anthraquinone. I. Site selective sublevel phosphorescence spectra for octane and hexane solutions
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Sublevel phosphorescence spectra of anthraquinone. I. Site selective sublevel phosphorescence spectra for octane and hexane solutions
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机译：Sublevel phosphorescence spectra of anthraquinone. I. Site selective sublevel phosphorescence spectra for octane and hexane solutions
The sublevel phosphorescence spectra originating from individual sites are observed. The sublevel phosphorescence spectra obtained have vibrational structures which are quite simple as compared with the complicated structures usually found in multisite and thermally averaged phosphorescence spectra. The vibrational analysis can be performed straightforwardly. TheTzspectrum has vibronic bands due tob1uvibrations only. These vibronic bands are mainly due to the vibronic coupling between the3B1g(npgr;ast;) lowest triplet state with a closely located3Au(npgr;ast;) state. TheTxspectrum has vibronic bands involvingb3uvibrations only. The intensity mainly comes from a mechanism which involves vibronic coupling between1B2g(sgr;pgr;ast;) and1B1u(pgr;pgr;ast;). TheTyphosphorescence spectrum has vibronic bands involvingb2uvibrations only. The intensity comes from a mechanism which involves vibronic coupling between3B1g(npgr;ast;) and3B3u(sgr;pgr;ast;). The rigorous selectivity in the appearance of vibronic bands in the sublevel phosphorescence spectra reveals that the molecule retains itsD2hsymmetry in the triplet state. This conclusion contradicts with the one given by Khalil and Goodman. Finally some comments are made concerning previously given vibrational assignments.
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