Abstract
IN addition to the normal fluorescence emission with a decay constant of ∼ 109 sec.−1, a slow component with a decay constant of ∼ 103 sec.−1 has been detected by Dikun in the luminescence of phenanthrene vapour1. On the grounds that the spectra of both components are identical, Williams2 has attributed this delay to the reversible formation of an excited dimer, from normal and electronically excited molecules, which has a life-time of the order of a millisecond.
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References
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Hardtl, K. H., and Scharmann, A., A. Naturforsch., 12 a, 715 (1957).
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STEVENS, B., HUTTON, E. & PORTER, G. Spectrum of Delayed Fluorescence in Phenanthrene Vapour: a Criterion of Purity. Nature 185, 917–918 (1960). https://doi.org/10.1038/185917a0
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DOI: https://doi.org/10.1038/185917a0
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