Abstract
Lewis and Kasha1 have directed attention to the phosphorescence induced by ultra-violet light on a number of organic compounds, particularly nitro-compounds, dissolved in the ‘glass’ produced when their solutions in suitable solvent mixtures are cooled to liquid-air temperature. They attribute this phenomenon to the formation of triplet-levels from the original excited singlets, the phosphorescence resulting from the triplet–ground-level change being unquenched owing to the greatly diminished thermal agitation at low temperatures in the glass.
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References
Lewis and Kasha, J. Amer. Chem. Soc., 66, 2100 (1944).
Reid, J. Chem. Phys., 20, 1212, 1214 (1952).
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FOSTER, R., HAMMICK, D. Emission of Molecular Complexes of Nitro-compounds. Nature 171, 40 (1953). https://doi.org/10.1038/171040a0
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DOI: https://doi.org/10.1038/171040a0
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