Laser Induced Fluorescence Excitation Spectra of CF₂ in a Supersonic Jet cooled

Laser induced fluorescence excitation spectrum of CF₂ A¹B ₁←X¹A₁ around 250nm has been measured under the supersonic free jet conditions。CF is produced by DC discharge of CF seeded in argon gas with a ratio of 1/40.39 vibronic bands belonging to the different band systems are assigned in which 23 vibronic bands are first labeled The previously indefinite assignments are conclusively labeled,Through analysis of the K structure resolved spectra,especially,observations of the combination excitation of symmetric mode and bend mode,vibronic assignments of the observed band systems are confirmed And CF A state stretching frequencies are first expermentaly determined to be =1012.1cm, =1180.2 These can not support King’s tentative assignments,But are in good agreement with Cameron’s calculated results Furthermore,some new molecular constants are obtained