# EXTERNAL HEAVY-ATOM SPIN-ORBIT COUPLING: THE $T_{1}$ VIBRONIC ACTIVITY OF NAPHTHALENE IN p-DIHALOGENATED BENZENE HOST CRYSTALS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/16017

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 Title: EXTERNAL HEAVY-ATOM SPIN-ORBIT COUPLING: THE $T_{1}$ VIBRONIC ACTIVITY OF NAPHTHALENE IN p-DIHALOGENATED BENZENE HOST CRYSTALS Creators: Gash, Bruce W.; Colson, S. D. Issue Date: 1973 Publisher: Ohio State University Abstract: The phosphorescence of naphthalene in p-dibromobenzene, $\alpha$-phase p-dichlorobenzene, and $\gamma$-phase p-dichlorobenzene host crystals has been studied at high resolution and $4.6^{\circ} K$ . The $T_{1}$ absorption of naphthalene in a p-dibromobenzene host crystal at $4.6^{\circ} K$ was recorded by the use of excitation spectroscopy. With the exception of the $b_{3g}$ $\nu_{17}$ fundamental (which is nearly degenerate with the $a_{g} \nu_{1}$ fundamental and probably borrows intensity from it) only vibrations of $a_{g}$ symmetry are active in the naphthalene $T_{1}$ absorption and emission. This vibronic activity indicates that the external spin-orbit coupling mechanism operative in the heavy-atom-containing chemically mixed crystal is different from the internal spin-orbit coupling mechanism active in the $T_{1}$ of naphthalene in a deuteronaphthalene crystal. Description: Author Institution: Sterling Chemistry Laboratory, Department of Chemistry, Yale University, URI: http://hdl.handle.net/1811/16017 Other Identifiers: 1973-I-05