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dc.creatorChan, I. Y.en_US
dc.creatorGoldenberg, Barbara L.en_US
dc.creatorSandorfy, C.en_US
dc.descriptionAuthor Institution: Department of Chemistry, Brandeis Universityen_US
dc.description.abstractA new technique of time-resolved magnetic resonance (TRMR) will be described. A phosphorescent molecule is excited by a $N_{2}$-pumped dye-laser. The phosphorescence is monitored shortly after the laser pulse using a boxcar integrator. Introduction of microwaves at magnetic resonance conditions causes a nutation of the spin system, thus modulating the phosphorescence output. It is therefore possible to detect magnetic resonance optically only a few nanoseconds after the creation of the coherent spin system. This time-resolved method is particularly useful in studying excited states with very short lifetimes. The technique is also advantageous in systems with such a high spin relaxation rate that conventional ODMR experiments are difficult. We will demonstrate the feasibility of this technique with benzil neat crystals as our test system. Benzil has a non-first-order phase transition at 84 K, and it phosphoresces at room temperature with a fair quantum yield. The new TRMR technique has been used at elevated temperatures in order to elucidate the nature of the phase transition, as well as the identity of the phosphorescing species at higher temperatures. These results will be presented and discussed.en_US
dc.format.extent147534 bytes
dc.publisherOhio State Universityen_US

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