Fluorescence of mono-olefinic hydrocarbons

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Abstract
A weak fluorescence has been observed from propylene, 1−butene, cis−2−butene, trans−2−butene, 1−hexene, cis−2−hexene, trans−2−hexene, 2−methyl−2−pentene, and 2,3−dimethyl−2−butene excited at 184.9 nm in vapor and/or liquid phases. Emission spectra and emission quantum yields are reported. For 2,3−dimethyl−2−butene (tetramethylethylene) the emission intensity was sufficiently strong to permit more detailed study of its properties, and accordingly the effect of longer wavelength excitation, the effectiveness of CCl4 and O2 as quenchers, and the effect of solution in low−temperature hydrocarbon matrices are additionally reported. Possible assignments for the olefin emissions are discussed.