ZERO-FIELD MAGNETIC RESONANCE STUDY ON THE PHOSPHORESCENT TRIPLET STATE OF BENZIL
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Date
1975
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Publisher
Ohio State University
Abstract
The properties of the lowest excited triplet state of benzil in neat crystals have been studied with zero-field experiments combining microwave and optical spectroscopy. 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 sub-1evels almost totally dominates the populating and depopulating activities of the phosphorescent triplet state. A new and more accurate method for the determination of the steady-state population ratios will be presented, A discussion of the geometry of the benzil triplet state will be given, and it is proposed that benzil assumes a trans (near) planar configuration in the lowest triplet state. Finally, a change in the aero-field resonance spectrum will be described near a second order phase transition of benzil crystals near 80$^{\circ}$K.
Description
Present address of B. N. Nelson: Department of Chemistry, Harvard University, Cambridge, Massachusetts, 02138.
Author Institution: Department of Chemistry, Brandeis University
Author Institution: Department of Chemistry, Brandeis University