Tunable KrF laser-induced fluorescence of C[sub 2] in a sooting flame

Brockhinke, A.; Hartlieb, A.T.; Kohse-Höinghaus, K.; Crosley, D.R.
November 1998
Applied Physics B: Lasers & Optics;1998, Vol. 67 Issue 5, p659
Academic Journal
Abstract. We have observed laser-induced fluorescence of two different band systems of C[sub 2] in a flame, excited by a tunable KrF laser near 248 nm. The first comprises several P and R lines of the (1,0) band of the e [sup 3]SIGMA[sub g] - a [sup 3]SIGMA[sub u] Fox-Herzberg system, with fluorescence bands extending past 350 nm. The second is the band head region of the (7,1) band of the D [sup 1]SIGMA[sup +, sub u] B' [sup 1]SIGMA[sup +, sub g] system, with fluorescence at 232 nm from D to the X [sup 1]SIGMA[sup +, sub g] ground state. Neither band has been previously observed in any environment. The flame in these experiments is highly sooting, and the C[sub 2] seen here is likely produced by laser vaporization of the soot with subsequent laser photolysis of a C[sub 2] precursor. In a rich flame, this fluorescence could cause interferences in other studies such as KrF laser Raman scattering. Moreover, signal level calculations suggest native C[sub 2] near 10 ppm could be readily observed using the Fox-Herzberg excitation. Raman measurements of major species (X is greater than or equal to 0.01) in the same flame, using the KrF laser, are in good agreement with a model prediction.


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