SHOCK WAVES IN CHEMICAL KINETICS: FURTHER STUDIES IN THE DISSOCIATION OF FLUORINE.
MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMISTRY
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The rate of dissociation of molecular fluorine was determined in the temperature range 1300-1700K by observing spectrophotometrically the disappearance of F2 molecules behind shock waves in a shock tube. Experiments were made in 5 F2-95 Ar, 5 F2-20 Kr-75 Ar, 10 F2-20 Kr-70 Ar, 5 F2-20 Xe-75 Ar, and 10 F2-20 Xe-70 Ar mixtures. The results in mixtures with only F2 and Ar present, combined with earlier work, give log kD1mole litersec 9.49 - 5970T corresponding to an apparent activation energy of 27.3 plus or minus 2.5 kcalmole for the rate of the reaction M F2 to M 2F. The experiments with added Kr showed no anomalies, and indicated that Kr is at most only slightly more efficient than Ar in this reaction. The experiments with added Xe showed anomalous results. No quantitative conclusions could be drawn, but it appears highly likely that XeF is an important intermediate in the reaction system, and that XeF2 is present in appreciable amounts in the final equilibrium mixtures. Author
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy