Singlet—Triplet Exciton Absorption Spectra in Naphthalene and Pyrene Crystals

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Abstract
Singlet—triplet exciton absorption spectra have been measured in naphthalene and pyrene single crystals at room temperature by observing the dependence of the ``anti‐Stokes'' emission intensity resulting from mutual annihilation of triplet pairs on the wavelength of exciting light. The origin of the naphthalene spectrum is at 21 170 cm−1, and the most prominent intervals in the vibrational structure are 490 and 1360 cm−1. The origin of the pyrene spectrum is at 16 850 cm−1, and the vibrational structure for the lowest triplet state in this crystal includes the intervals 410, 1210, 1380, and 1590 cm−1.