Magnetic-Field-Modulated and Time-Resolved Luminescence in Organic Crystals Excited by High Energy Radiation

摘要

Magnetic field modulation of time resolved radioluminescence in organic crystals is a useful source of information on the spatial distribution and the temporal evolution of the primary activated species created by high energy particles and photons. Recent results obtained with anthracene crystals under various excitation conditions are presented. It is shown that fine structure modulation of the prompt and delayed scintillation components helps to elucidate the details of track structure as well as the role of exciton fission and fusion in the irradiated crystal. Besides the fine structure modulated fluorescence, a hyperfine structure modulated component has been detected. It is related to electron-hole recombination in special spur configurations where one of the charge carriers is trapped in a complex with a triplet state excited by the hot electron. (Atomindex citation 14:717058)