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dc.creatorSpears, K. G.en_US
dc.creatorEl-Manguch, Mahmouden_US
dc.date.accessioned2006-06-15T13:47:54Z
dc.date.available2006-06-15T13:47:54Z
dc.date.issued1976en_US
dc.identifier1976-RS-12en_US
dc.identifier.urihttp://hdl.handle.net/1811/9757
dc.descriptionAuthor Institution: Northwestern Universityen_US
dc.description.abstractWe have used time correlated photon counting with a mode-locked, cavity dumped cw laser to study the emission lifetimes from pyrimidine in its $^{1}B_{1}$ excited state. The emission exhibits a dual decay in all bands with two lifetimes in the range of 1 to 500 nsec. The 0-0 band shows a very small amount of shore lifetime, emission ($ < 0.1%$ ) while bands at higher energies have dominant amounts of short lived emission. The long lifetime emission is easily trenched and the overall data fit a model of reversible intersystem crossing. Pyrimidine is vary near small molecule behavior in its 0-0 band and the lengthenend lifetime can be combined with analysis of the dual decay to give a natural radiative lifetime and individual rate constants for the forward and reverse crossings. These values vary with band energy above the origin and show that pyrimidine ranges from nearly small molecule singlet-triplet coupling to large molecule irreversible decay. We also report the high resolution excitation spectra of several absorption bands in which the emission was separated according to long and short lifetimes. Those excitation spectra reveal regions of stronger and weaker couplings as shown by the separate peak structure of each time region and their non-conformance to the absorption spectra.en_US
dc.format.extent151971 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleDUAL LIFETIMES AND TIME SEPARATED EXCITATION SPECTRA OF PYRIMIDINEen_US
dc.typearticleen_US


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