The Near Ultraviolet Absorption Spectrum of Para-Difluorobenzene Vapor

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Abstract
The vapor spectrum of p‐difluorobenzene was obtained with a Bausch and Lomb Littrow spectrograph. The band at 36 843 cm—1 is assigned as the 0,0 band of the Ag—B3u electronic transition. Ground‐state frequencies of 452, 860, and 1259 cm—1 with the corresponding excited‐state frequencies of 408, 819, and 1250 cm—1 are assigned to totally symmetric vibrations. Also, an 841‐cm—1 frequency is assigned to the ground state of a totally symmetric vibration. Many of the bands that are temperature dependent are shown to result from a transition that involves a 248‐cm—1 ground‐state vibration. This 248‐cm—1 frequency is assigned as a β1g fundamental. Most of the prominent bands are assigned to progressions or combinations of the above frequencies. The unusually large spectral shift produced by the two para‐positioned fluorines is discussed.

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