Molecular Spectroscopy of the Triplet State through Optical Detection of Zero-Field Magnetic Resonance

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Abstract
Research on the phosphorescent states of organic molecules has experienced a very active and rapid growth since World War II. The growth was undoubtedly initiated in 1944 by the identification of phosphorescence in organic molecules with the triplet state by Lewis and Kasha [1]. Since then, a great number of experimental and theoretical studies on the triplet state have been accumulated [2], probably because of the recognition of the key role of the triplet state in photochemistry, photophysics, and photobiology. The paramagnetism due to two parallel spins characteristic of the triplet state has also attracted many researchers in the field of magnetic resonance.