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dc.creatorOkajima, S.en_US
dc.creatorLim, E. C.en_US
dc.date.accessioned2006-06-15T14:08:10Z
dc.date.available2006-06-15T14:08:10Z
dc.date.issued1978en_US
dc.identifier1978-TH-11en_US
dc.identifier.urihttp://hdl.handle.net/1811/10668
dc.descriptionAuthor Institution: Department of Chemistryen_US
dc.description.abstractThe emission spectra of quinoline and isoquinoline have been investigated in the vapor phase at room temperature. An effective quenching of $S_{2}(\Pi \Pi^{*}) \rightarrow S_{O}$ fluorescence (resonance fluorescence) of isoquinoline by high pressure buffer gas ($\sim$ 1000-2000 Torr) indicates that the $S_{2}(\Pi \Pi^{*}) \rightarrow S_{1} (n \Pi)$ internal conversion from low vibrational levels in $S_{2}$ is collision-ally induced. The excitation energy dependence of the quantum yield of $S_{2}(\Pi \Pi^{*})$ fluorescence suggests that an irreversible $S_{2}(\Pi \Pi^{*}) \rightarrow S_{1}(n \Pi^{*})$ internal conversion takes place effectively from higher vibrational levels of $S_{2}$. The vibrationally excited $S_{1}$ produced by internal conversion from $S_{2}$ must decay primarily by $S_{1} \rightarrow S_{O}$ internal conversion since the quantum yield of triplet formation, monitored by the sensitized phosphorescence of biacetyl, exhibits a sharp decrease with increasing excitation energy. Qutnoline vapor shows $T_{1}(\Pi \Pi^{*})\rightarrow S_{O}$ phosphorescence as well as $S_{1}(n\Pi^{*})\rightarrow S_{O}$ fluorescence. The excitation energy dependence of fluorescence and phosphorescence quantum yields indicates that the internal conversion is also a prominent radiationless process in this molecule.en_US
dc.format.extent135211 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleRADIATIONLESS TRANSITIONS IN QUINOLINE AND ISOQUINOLINE VAPORSen_US
dc.typearticleen_US


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