Abstract
Abstract Angular dependent EPR spectra of anthracene single crystals irradiated with γ rays at 77° K have been measured and two kinds of septet side lines with 7.5 G splitting and maximum separations by 237.5 and 206.3 G were found. From the spectra the presence of two kinds of radical pairs were concluded, whose pair axes lie within ac-plane and directed in 90° and 45° from the a-axis. Similar septet side lines were also found in the crystals which were annealed at room temperature for one hour. Radicals forming a pair were considered to be 9-dibenzo-cyclohexadienyl radical judging from the septet line of 7.5 G splitting and the stability of radicals. The directions of pair axes were discussed on the base of the migration of hydrogen atom within the ab-plane.
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