Accession Number : AD0646057

Title :   SHOCK WAVES IN CHEMICAL KINETICS: FURTHER STUDIES IN THE DISSOCIATION OF FLUORINE.

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMISTRY

Personal Author(s) : Seery,Daniel J. ; Britton,Doyle

Report Date : DEC 1966

Pagination or Media Count : 19

Abstract : 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 kD(1/mole liter/sec) = 9.49 - 5970/T (corresponding to an apparent activation energy of 27.3 plus or minus 2.5 kcal/mole) 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)

Descriptors :   (*SHOCK WAVES, REACTION KINETICS), (*FLUORINE, DISSOCIATION), (*XENON, CHEMICAL COMPOUNDS), DIATOMIC MOLECULES, SPECTROSCOPY, SHOCK TUBES, ARGON, KRYPTON, FLUORIDES, CHEMICAL EQUILIBRIUM, SYNTHESIS(CHEMISTRY)

Subject Categories : Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE