Gas Phase Laser Induced Fluorescence Spectroscopy of CFCl

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Journal of Chemical Physics

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The CFCl radical has been produced in the gas phase by both IR multiphotonphotolysis of C2F3Cl and He metastable reaction with C2F3Cl. Single vibronic level fluorescence and excitation spectra taken of this species have yielded sufficient information to determine certain vibronic constants. The excited state was found to have an origin of T 0=25 283±5 cm−1 with vibrational frequencies: ω2′=394±3 cm−1 and ω3′=739±5 cm−1. In the ground state, the vibrational frequencies were found to be: ω3 ″=118±10 cm−1, ω2 ″=448±6 cm−1, and ω3 ″=750±6 cm−1. The rotational structure of the vibronic bands is similar to those of band transitions of a near prolate top, and the electronic transition has been tentatively identified as ? 1 A ″←? 1 A′ by analogy to similar CF2 transitions. The radiative lifetime of the excited state, τ r =700±10 nsec, was found to be independent of the rovibronic excitation frequency. The change in the major rotational constant was found to be A′−A ″=1.8±0.2 cm−1.

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