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The matrix-isolated infrared (IR) spectra of the lowest triplet (T1) states of acridine and phenazine have been obtained by direct measurement. Population of T1, sufficient for IR detection, is achieved by pulsed indirect pumping with an Ar+ laser source. The ground and triplet state IR spectra were 180° out of phase, providing unambiguous indentification of the excited metastable state absorptions. Approximate T1 vibrational assignments are made on the basis of analogous experimental and theoretical results for ground state acridine, phenazine, and anthracene.
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Mitchell et al. (1981) studied this question.
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