THE ULTRAVIOLET SPECTRUM OF THE FeF RADICAL

$^{a}$ B. Pouilly, J. Schamps, D. J. W. Lumley and R. F. Barrow, J. Phys B: Atom. Molec. Phys., 11, 2289, (1978). $^{b}$ M. D. Allen and L. M. Ziurys, J. Chem. Phys., 106(9), 3494 (1997).Author Institution: The Physical and Theoretical Chemistry LaboratoryTwo band systems of the FeF radical have been recorded at Doppler-limited linewidths by Laser Induced Fluorescence. The (0,0) band of the $^{6}\Pi-X^{6} \Delta$ was recorded at 323 nm. The system at 330 nm consisted of and overlap of the (1,0) band of the $^{6}\Pi-X^{6} \Delta$ system and the (0,0) band of the $^{6}\Phi-X^{6} \Delta$ system. FeF was producedd in a continuous flow by the reaction of fluorine atoms, produced by a microwave discharge of fluorine in helium, with iron pentacarbonyl. This reaction provides date for the lowest four sub-bands of each system, considerably extending our knowledge of these two electronic transitions compared with previous work by $Pouilly et al.^{a}$ The temperature of the temperature of the sample in our experiments is slightly above ambient, about 450 K, The results have been analysed and combined with the millimeter-wave $spectra^{b}$ for the ground state, $^{6}\Delta$, to produce better parameters for the excited states