Abstract
The properties of the lowest excited triplet state of benzil in neat crystals have been studied with zero-field experiments combining microwave spectroscopy and optical detection. Two emitting species, originating from X traps of benzil crystals, were detected. The two X traps were found to have quite different trap depths and zero-field splittings, yet their triplet kinetics proved to be the same. One of the three spin sublevels almost totally dominates the populating and depopulating activities of the phosphorescent triplet state. A new and more accurate method is described for the determination of the steady-state population ratios. A discussion of the geometry of the benzil triplet state is given, and it is proposed that benzil assumes a trans- (near) planar configuration in the lowest triplet state. Finally, a change in the zero-field resonance spectrum is reported near a second order phase transition of benzil crystals near 80 °K.
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