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  • 1
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    Carbon kinetic isotope effect in the reaction of CH4 with HO (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The carbon kinetic isotope effect in the CH4 + HO reaction is measured experimentally and the use of carbon isotope ratios to diagnose atmospheric methane is examined. The chemical, photolysis, and analytical experimental conditions and procedures are described. It is determined that the CH4 + HO reaction has a carbon kinetic isotope effect of 1.010 + or 0.007 for k(12)k(13) (rate constants ratio) at 297 + or - 3 K. This value is compared with the data of Rust and Stevens (1980). Causes for the poor correlation between the data at high methane conversions are discussed. It is supposed that the difference between the k(12) and k(13) values is due to a difference in the activation energy of the two reactions.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 2195-219
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    NASA TECHNICAL REPORTS
  • 2
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    Temperature dependence of the rate constants for reactions of O/1D/ atoms with a number of halocarbons (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Results are reported for an experimental study of the reactions of O(1D) with CCl4, CFCl3, CF2Cl2, CHFCl2, CHF2Cl, and CF2ClCFCl2 over the temperature range from 173 to 343 K, based on the time-resolved emission of O(1D) at 630 nm. The experiments involved photolysis of O3 by Nd-YAG laser pulses and measurements of 630-nm emission intensity in mixtures with He and the various halocarbons. Pseudo-first-order rate constants are derived from plots of the logarithms of the 630-nm emission intensities as a function of time for particular He/O3/halocarbon mixtures, and second-order rate constants are then obtained from plots of these pseudo-first-order rate constants as a function of halocarbon concentration at constant He and O3 concentrations. No temperature dependence of the second-order rate constants is observed over the range studied, within the precision of the measurements. It is found that the rate constants decrease as H is substituted for Cl in a halocarbon molecule and as F is substituted for H or Cl.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Chemical Physics; 69; Nov. 1
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    NASA TECHNICAL REPORTS
  • 3
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    O2/1-Sigma sub g/+// relaxation in collisions - Temperature dependence of the interaction with HBr (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Rate constants for the quenching of O2(1-Sigma sub g(+)) in the temperature range 170-400 K were obtained by observing the change in the rate of decay of this oxygen emission as a function of HBr concentration. At each temperature the decay was observed at eight different HBr concentrations ranging from 0 to 6 x 10 to the -6th moles/l. It is found that long range multipolar interactions make a major contribution to the quenching of the oxygen molecule by H2, with the quenching shown to be most effective at low temperatures. Short range repulsive interactions may also contribute to the quenching process, especially at high temperatures. The suggestion that the quenching process is dominated by the ability of the quencher to take up the energy of the oxygen molecule transition in vibrational and rotational motion is confirmed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Chemical Physics Letters; 42; Aug. 15
    Format: text
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    NASA TECHNICAL REPORTS
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