Abstract

Sections of the ν 4 band of benzene near 674 cm −1 have been recorded under conditions of Doppler-limited resolution using a diode laser spectrometer. In contrast to earlier measurements on this parallel band both the J and the K structures were resolved and this has enabled a number of band parameters to be determined accurately for the first time. The set of ground state constants determined from these data are compared with those determined by J. Pliva and A. S. Pine ( J. Mol. Spectrosc. 93, 209–236 (1981)) using a difference frequency laser system.

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