Intense bluehyphen;green fluorescence from a structured band centered at lgr;sim;484 nm has been observed from Ar, CF3I, and NF3(or F2) gas mixtures (T=300 K) excited by a sim;3hyphen;ns FWHM electron beam. This emission is tentatively assigned to theErarr;A3pgr;1transition of the iodine monofluoride (IF) molecule. From the temporal behavior of the IFast; and I2ast; (342 nm) emission, it has been determined that the IF (E) level is formed primarily by excitation transfer from Iast; (4P) states. The fluorescence efficiency of the IF (Erarr;A) band and the IFast; (E) state radiative lifetime have been estimated to be sim;6percnt; (in 99.83percnt; Ar/0.13percnt; CF3I/0.04percnt; NF3mixtures.PTOTALap;2300 Torr) and sim;15 ns, respectively. The emission band structure, the short IF (E) radiative lifetime, and the Franckhyphen;Condon shift between theEandAstates suggest that IFast; is an attractive candidate for a bluehyphen;green laser.
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