Magnetic Resonance Spectroscopy of Triplet-State Organic Molecules in Zero External Magnetic Field

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Abstract
Some derivations are given for approximations to the energy levels and eigenstates of triplet‐state organic molecules in external magnetic fields of such a magnitude that the electron Zeeman interaction is small relative to the intramolecular electron–electron interaction. An exact calculation of the exactly zero external field magnetic resonance spectrum of photoexcited naphthalene is given. Experimental measurements of the zero‐field spectrum of naphthalene are presented. The results of the approximate and exact treatments are compared with these results and with other available experimental information.