SPIN-SPECIFIC PHOTOPHYSICAL STUDY OF BIACETYL
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Publisher:Ohio State University
The technique of optically detected magnetic resonance has been used to study the phosphorescent triplet state of biacetyl. By employing the methods of microwave-induced-delayed-phosphorescence (MIDP) and microwave-saturation-recovery, the populating and decay kinetics of the individual spin-levels have been measured. The orientatins of the principal magnetic axes relative to the molecular frame have been determined by a high-field EPR experiment. These data will be presented and discussed in terms of the spin-specific photophysics of biacetyl. Specifically the spin level oriented approximately along the carbonyl bond is the principal radiative decay pathway, but both in-plane levels are important in the intersystem cross-over to the triplet. These features will be rationalized by reference to the electronic energy level scheme of the molecule.
Author Institution: Department of Chemistry, Brandies University