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dc.creatorHarris, Charles B.en_US
dc.date.accessioned2006-06-15T13:29:58Z
dc.date.available2006-06-15T13:29:58Z
dc.date.issued1972en_US
dc.identifier1972-D-1en_US
dc.identifier.urihttp://hdl.handle.net/1811/8943
dc.descriptionAuthor Institution: Department of Chemistry, University of Californiaen_US
dc.description.abstractPhosphorescence microwave double resonance experiments, in which changes in the intensity and /or polarization of phosphorescence from triplet excition states is monitored while a microwave field pumps the zero-field spin sublevels, are presented which experimentally differentiate between diffusion limited exciton migration and migration describable by the group velocity of the wave packet of k states, i.e., coherent exciton migration. The relationships between microwave spectroscopy, coherent triplet exciton migration and density of states functions in molecular crystals will be developed and illustrated for 1,2,4,5-tetra-chlorobenzene crystals which can be considered a model for a one-dimensional exciton. In addition, an electron spin resonance theory which incorporates explicitly exciton-phonon scattering into the Block equations and allows one to extract the temperature dependence of the coherence length will be presented and applied to 1,2,4,5-tetrachlorobenzene crystals which can be considered a model for a one-dimensional exciton. In addition, an electron spin resonance theory which incorporates explicitly exciton-phonon scattering into the Block equations and allows one to extract the temperature dependence of the coherence length will be presented and applied to 1,2,4,5-tetrachlorobenzene crystals. A coherence length of 10,000-30,000 {\AA} is experimentally found at $3.2^{\circ} K$ . Finally, arguments will be presented that suggest that below certain temperatures coherent exciton migration might be the rule rather than the exception in molecular crystals.en_US
dc.format.extent161867 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleCOHERENT MIGRATION OF TRIPLET EXCITONS IN MOLECULAR CRYSTALSen_US
dc.typearticleen_US


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