Abstract
The electronic emission spectrum of benzaldehyde vapour excited in a discharge consists mainly of ã 3A″-X̃ 1A′ phosphorescence but also contains some weak à 1A″-X̃ 1A′ fluorescence. The spectrum has been photographed under high resolution with a view to establishing which a″ vibrations are active in the ã-X̃ system. We have shown, with the help of rotational band contours, that the vibration in which the substituent as a whole moves out-of-plane is weakly active and that the substituent torsional vibration is more weakly active. These are the only a″ vibrations which are active with sufficient intensity to be observed in the spectrum. In the Ã-X̃ fluorescence an a″ wagging vibration of the hhydrogen atoms of the phenyl ring is moderately strongly active, as is the corresponding excited state vibration in the Ã-X̃ absorption system
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