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  • 1980-1984  (1)
  • 1970-1974  (7)
  • 1
    Electronic Resource
    Electronic Resource
    High temperature study of the reactions of O and OH with NH3 (1984)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 16 (1984), S. 725-739 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mixtures of NH3 and N2O dilute in Ar were heated behind incident shock waves in the temperature range 1750-2060 K. A cw ring dye laser, tuned to the center of an OH absorption line in the ultraviolet, was used to monitor OH concentration profiles by absorption spectroscopy. Infrared emission was used to follow N2O (at 4.5 μm) and NH3 (at 10.5 μm) concentration - time histories. The early-time NH3 and OH concentration profiles were sensitive to the rate constants of the reactionsleading to the following best-fit expressions for k2 and k3:k2 = 1013.34±0.3 exp(-4470/T) and k3 = 1013.91±0.2 exp(-4230/T) cm3 mol-1 s-1. The results of this study combined with previous low-temperature data suggest a significant non-Arrhenius behavior for both k2 and k3.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550160609
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Determination of the rate constant for the reaction O + NO yields N + O2 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A shock-tube technique was used to determine the rate constant for the reaction O + NO yields N + O2 in the 2500-4100 K range. Mixtures of NO, N2O, and an inert gas (Ar or Kr) were shock-heated, and the decay of infrared emission from the fundamental vibration-rotation band of NO at 5.3 microns was monitored. The N2O dissociates quickly to provide a source of O atoms for the above reaction. An expression for the rate constant is derived which fits these data and previous data at higher and lower temperatures.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Combustion Science and Technology; 9; 3-4,; 1974
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Kinetics of nitric oxide formation and decomposition (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Experiments on shock wave structure were conducted in the 12 inch shock tube facility, and it is shown that this work was motivated by the need for improved kinetics for the modeling of NO production in space shuttle flow fields. The experiments on shock structure involved simultaneous observations of pressure and temperature on the wall of the shock tube during reflection of normal shock waves in inert gases.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-141272
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Decomposition of NO studied by infrared emission and CO laser absorption (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A diagnostic technique for monitoring the concentration of NO using absorption of CO laser radiation was developed and applied in a study of the decomposition kinetics of NO. Simultaneous measurements of infrared emission by NO at 5.3 microns were also made to validate the laser absorption technique. The data were obtained behind incident shocks in NO-N2O-Ar (or Kr) mixtures, with temperatures in the range 2400-4100 K. Rate constants for dominant reactions were inferred from comparisons with computer simulations of the reactive flow.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-CR-141275
    Format: application/pdf
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  • 5
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    Kinetics of the reaction of nitric oxide with hydrogen (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Mixtures of NO and H2 diluted in argon or krypton were heated by incident shock waves, and the infrared emission from the fundamental vibration-rotation band of NO at 5.3 microns was used to monitor the time-varying NO concentration. The reaction kinetics were studied in the temperature range 2400-4500 K using a shock-tube technique. The decomposition of nitric oxide behind the shock was found to be modeled well by a fifteen-reaction system. A principle result of the study was the determination of the rate constant for the reaction H + NO yields N + OH, which may be the rate-limiting step for NO removal in some combustion systems. Experimental values of k sub 1 were obtained for each test through comparisons of measured and numerically predicted NO profiles.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-141273
    Format: application/pdf
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  • 6
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    Ionization instabilities in a continuous- electrode generator (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Continuous electrode MHD generator ionization instabilities, measuring current distribution and transverse electric field
    Keywords: AUXILIARY SYSTEMS
    Type: JET PROPULSION LAB., SYMPOSIUM ON ENGINEERING ASPECTS OF MAGNETOHYDRODYNAMICS, 11TH, CALIFORNIA INST. OF TECH.; Mar 24, 1970 - Mar 26, 1970; PASADENA, CA
    Format: text
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  • 7
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    Investigation of nitric oxide decomposition in the temperature range 2500-4100 K (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The decomposition of nitric oxide has been studied in the temperature range 2500-4100 K using a shock-tube technique. The principle result of the study was the determination of the rate constant (k) for the reaction O + NO yields N + O2. Mixtures of NO and N2O diluted in argon or krypton were heated by incident shock waves and the infrared emission from the fundamental vibration-rotation band of NO at 5.3 microns was used to monitor the time-varying NO concentration. The experimental values of k are fit closely by the expression k = (2.36 times 10 to the 9th power) x T x exp(-38,640/RT) cm cu/mole-sec, which also provides a good fit to previous data at higher and lower temperatures.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: WSS/CI PAPER 74-7 , Spring Meeting; May 06, 1974 - May 07, 1974; Pullman, WA
    Format: text
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  • 8
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    Nonequilibrium shock wave structure, 1. Kinetics of nitric oxide formation and decomposition, 2 (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Theoretical and numerical aspects of molecular flow simulation focussed on the development of collision models for diatomic and triatomic gases undergoing rotational excitation and energy exchange. A laser absorption technique is proposed and analyzed as sufficiently sensitive for measuring rotational populations in a nonequilibrium shock wave. Also reported is a survey of available literature on NO chemical rate data in preparation for experiments on NO decompensation kinetics in atmospheric pollution.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-127691
    Format: application/pdf
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