Abstract
The nπ* electronic transition of CClF2–N=O, around 680 nm, is reported in detail for the first time. The spectrum was studied at low temperatures by laser excitation of fluorescence in a pulsed supersonic free jet. A characteristic long progression is assigned to torsion around the C–N bond in the excited state. The dispersed fluorescence is compared with the absorption spectrum of the static gas at 195 K. The electronic origin is located at 7047 Å, and the sharp absorption bands at longer wavelengths are assigned to torsional hot bands. Vibrational assignments of the electronic spectra are discussed. There is evidence that the gauche conformer of the excited state and only one conformer of the ground state are mainly responsible for the red side of the excitation spectrum in a cold jet.
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