Shock-Tube Determination of the C2(A 3Π→X 3Π) and CF(A 2Σ+→X 2Π) Band-System Oscillator Strengths

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Abstract
Reflected‐shock gas mixtures of C2ClF3, CF4, and C2F4 in excess argon were used to produce emission spectra of the C2(A 3Π—X 3Π) and CF(A 2Σ+—X 2Π) band systems. Absolute intensities of these electronic transitions were measured at several different wavelengths. Spectral data analyzed with equilibrium C2 and CF concentrations based on current JANAF heats of formation of the CF2 and CF radicals yielded for the Swan system the oscillator strength f(0, 0) in emission, 0.017±0.005 and for the CF system, 0.046±0.014. By reduction of the same data with recent shock‐tube heats of formation, the oscillator strength f(0, 0) for the Swan system was 0.028±0.009 and that for the CF system, 0.0051±0.0015.

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