Rotational band contour analysis in the 2710 Å system ofp-difluorobenzene

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Abstract
The 0–0 band of the 2710 å system of p-difluorobenzene has been rotationally analysed by the method of band contour analysis. It has been shown to be a type B band requiring a 1 B 2u –1 Ag electronic assignment. The rotational origin is at 36837·9 ± 0·2 cm-1. Interpretation of the excited state rotational constants indicates a contraction of the C-F bonds compared with the ground state and a ring geometry which differs only slightly from that of the 1 B 2u state of benzene. There is no evidence for non-planarity of the excited state.