The Fluorescence of Biacetyl Vapor

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Abstract
It has been shown that the fluorescence of biacetyl vapor at 25°C excited with 3650A radiation does not decay as a simple exponential function of time. After flash excitation, there is a ``fast'' fluorescence followed by a slow exponential decay. The quenching of the fluorescence has also been studied at several temperatures, pressures, and in the presence and absence of oxygen gas. A consideration of this and previous work permits a further elucidation of the fluorescence phenomena in terms of two upper emitting states. Fluorescence from the state responsible for most of the fluorescence at room temperature is quenched strongly by oxygen and is apparently completely removed at 200°. Fluorescence from the other state is unaffected by oxygen and is still measurable at 200°.

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