dc.creator Spangler, L. H. en_US dc.creator Matsumoto, Y. en_US dc.creator Pratt, D. W. en_US dc.date.accessioned 2006-06-15T14:46:50Z dc.date.available 2006-06-15T14:46:50Z dc.date.issued 1983 en_US dc.identifier 1983-MG-08 en_US dc.identifier.uri http://hdl.handle.net/1811/11846 dc.description Author Institution: Department of Chemistry, University of Pittsburgh en_US dc.description.abstract In this work, we will show that the decay of single’ rotational levels of the first excited singlet’ state of pyrazine can also be influcenced by small magnetic fields, thereby demonstrating that the coupled state is triplet in character. Under nanosecond excitation conditions. We find that neither $\tau^{+}$ nor $\tau^{-}$ are field dependent, but that $A^{+}/A^{-}$ increases in a sigmoidal fashion with the field, reaching a plateau at $H\sim 100$ G for all $J^{\prime}$ from 1--7. However, the decay of the $J^{\prime} = 0$ level shows no magnetic field dependence. This result, together with the results of similar studies of isotopically labeled pyrazines, suggests that the levels which are mixed by the field are the fine-structure components of the triplet state, which results in a breakdown of the $\Delta J = 0$ selection rule for intersystem crossing. The possible reasons for this behavior at such low fields will be discussed. $^{*}$Work supported by the National Science Foundation. en_US dc.format.extent 79533 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title MAGNETIC FIELD EFFECTS ON THE DECAY OF $^{1}B_{3u}$ PYRAZINE IN A SUPERSONIC $JET^{*}$ en_US dc.type article en_US
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