The Fluorescence of Acetone Vapor1

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Abstract
The ``blue'' fluorescence of acetone vapor has been photographed with a large Littrow‐type spectrograph giving a dispersion of about 16A/mm in the range used. Numerous bands having a roughly uniform spacing of about 122±10–15 cm−1 have been observed and their frequencies determined. Certain suggestions are made concerning the vibration analysis, but neither a detailed analysis nor a discussion of the relationship of these bands to the absorption spectrum is justified at present. The existence of structure in this fluorescence shows that it is unnecessary to assume that dissociation of the molecule accompanies the emission of fluorescent radiation. On the other hand, the existence of structure cannot be taken to prove the absence of dissociation following the emission process.