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  • 1
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    Mechanism and rate constant of the reaction between methylene and methyl radicals (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: Journal of Physical Chemistry; 79; July 31
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  • 2
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    Photochemical and kinetic measurements of atmospheric constituents vis-a-vis their role in controlling stratospheric ozone (1980)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: GEOPHYSICS
    Type: NASA, Washington Upper Atmosphere Res. Program; p 113-115
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  • 3
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    Extinction coefficients of NO2 and N2O4 (1976)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The extinction coefficient of NO2 has been measured in the spectral range from 185 to 410 nm as a function of temperature between 235 and 298 K. In order to correct for the effect of dimer absorption, the extinction coefficient of N2O4 has also been measured. The effect of a decrease in temperature on NO2 absorption is a reduction in the extinction coefficient of approximately 10% in the range from 320 to 380 nm.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Research; vol. 80A
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  • 4
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    Calculation of activation energies for hydrogen-atom abstractions by radicals containing carbon triple bonds (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Activation energies are calculated by the bond-energy-bond-order (BEBO) and the bond-strength-bond-length (BSBL) methods for the reactions of C2H radicals with H2, CH4, and C2H6 and for the reactions of CN radicals with H2 and CH4. The BSBL technique accurately predicts the activation energies for these reactions while the BEBO method yields energies averaging 9 kcal higher than those observed. A possible reason for the disagreement is considered.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: Journal of Physical Chemistry; 85; Dec. 10
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  • 5
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    A new channel for the formation of hydrogen cyanide in CH2-N2 systems (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The reaction between N2 and either the singlet or the triplet electronic state of CH2 is investigated in order to shed light on the formation of NO in fuel-rich hydrocarbon flames. For the reaction of N2 and the triplet CH2, a rate constant less than or equal to 10 to the minus 16th power cu cm/molecule-sec is obtained. The time history of hydrogen cyanide production from the CH2-N2 systems is discussed as a basis for understanding the possible reaction routes from HCN to NO.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Combustion and Flame; 32; June 197
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  • 6
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    The formation of the vinylidene radical as an intermediate in the combination of triplet methylene (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The vinylidene radical (H2C = C) is proposed as an intermediate in the combination reaction of triplet methylene. The conclusion is based upon the distribution of isotopic acetylenes produced from a 1:1 mixture of CD2 and CH2. The path of the reaction and the energetics of the intermediate species are discussed.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: Journal of Chemical Physics; 76; Jan. 15
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  • 7
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    Computations and estimates of rate coefficients for hydrocarbon reactions of interest to the atmospheres of outer solar system (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The rate coefficients, including Arrhenius parameters, have been computed for a number of chemical reactions involving hydrocarbon species for which experimental data are not available and which are important in planetary atmospheric models. The techniques used to calculate the kinetic parameters include the Troe and semiempirical bond energy-bond order (BEBO) or bond strength-bond length (BSBL) methods.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 56; 560-567
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  • 8
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    Extinction coefficient of H2CC(3B2) at 137 nm (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: In spite of the conduction of numerous studies regarding the vinylidene free radical, its role and importance as a reactive intermediate is not well characterized. Laufer (1980, 1983) has reported the absorption spectrum of metastable H2CC(3B2), the lowest excited state, in the vacuum ultraviolet and has measured several aspects of its quenching properties. The present study provides a measurement of the extinction coefficient of H2CC(3B2). Knowledge of the vinylidene concentration is required to convert readily available absorption data into an extinction coefficient or cross section. In the current work, the H2CC(3B2) concentration was determined in an investigation of the photodissociation of vinyl chloride.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 83; 908-910
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  • 9
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    Photochemistry of bromoacetylene - Formation of HBr and quenching of excited Br/4 2P 0 1/2/ (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The photolysis of bromacetylene is examined by means of vacuum ultraviolet flash photolysis-kinetic spectroscopy, with attention given to the production of Br atoms in the 2P 0 3/2 and 2P 0 1/2 states, the production of HBr, and UV absorption attributable to the ethynyl radical. Although Br(2P 0 1/2) and Br(2P 0 3/2) were both directly observed at the shortest delay time after the flash, strongly indicating the presence of the ethynyl radical, transient absorption by C2H was not detected in the range 125 to 180 nm. Quenching rate constants for the decay of the 2P 0 1/2 state of Br, which is observed to form concurrently with the ground state, are derived for quenching by He, CH2Br, CF4, and D2 from the pseudo-first-order decay rates. HBr was observed as a secondary photolysis product, and a model of its formation by the exothermic reaction of ground-state atoms with C2HBR, coupled with the secondary production of Br atoms, is found to agree well with the experiment.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: PB80-120868 , Journal of Physical Chemistry; 83; Oct. 18
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  • 10
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    Atmospheric quenching of vibrationally excited O2/1 Delta/ (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The paper presents photolysis absorption spectroscopy experimental results which show rapid vibrational quenching of O2(1 Delta, v not less than 1) molecular oxygen fragments in an atmospheric environment. The reactions of this species were determined by flash photolysis of ozone in the Hartley band combined with absorption spectroscopic detection of O2(1 Delta v equals 0) fragments and resonance fluorescence detection of O(3P). It was shown that rapid vibrational deactivation occurs under atmospheric conditions; in addition, an upper limit was determined for the photolytic channel of the O(1D) + O3 yields O2(1 Sigma) reaction.
    Keywords: GEOPHYSICS
    Type: PB81-123622 , Journal of Chemical Physics; 73; Sept. 15
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