Abstract
Kinetics of the transient magnetization of phenazine and its heteroexcimer accompanying pulsed photoexcitation in crystals of fluorene are reported. The measurements are made over a wide range of temperature. Transient nutation of the phenazine magnetization is observed with pulsed laser excitation. The kinetic behavior is consistent with prompt excitation of the phenazine triplet followed by formation of the excimer with conservation of component of angular momentum along the field. The excimer is not observed in a dibenzofuran host, but is observed with diminished intensity in a host containing one molecule of fluorene per five molecules of dibenzofuran, suggesting that the excimer contains only one fluorene molecule.
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