Optical and Electron Paramagnetic Properties of Radicals in Naphthalene and Anthracene Crystals
The impurity and defect states in organic crystals have been studied by several authors1),2) particularly for the purpose of clarifying the energy transfer processes in organic materials. Most studies have been made for aromatic hydrocarbon crystals which include another aromatic hydrocarbon molecule as an impurity. In such cases the highest electronic state of the impurity is fully occupied. On the other hand the radical with an additional hydrogen atom to anthracene or naphthalene molecules (the cyclohexadienyl-type radical, referred as C-radical) and with a missing hydrogen atom from these molecules (the aryl-type radical, referred as A-radical) has a half-occupied orbital and the crystal containing these radicals would offer an interesting system to study the interaction between the localized state and the host lattice in organic crystals.
KeywordsElectron Paramagnetic Resonance Molecular Crystal Energy Transfer Process Lower Excited State Organic Crystal
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