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  • 1
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    High resolution absorption cross sections for the A2Pi-X2Pi system of ClO (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: High-resolution ultraviolet absorption cross-sections for the ClO molecule are obtained, with the aim of facilitating studies of ozone depletion resulting from the injection of chlorofluorocarbons into the atmosphere. The spectroscopic analysis, which involves a frequency-doubled tunable dye laser with a bandwidth of 0.015 A, is described. Studies of the rotational lines of the ClO A 2Pi 3/2-X2Pi 3/2 9-10 band were conducted. Peak cross-sections for the P and R lines of the 9-0 band are found to be 10.0, 9.6, 8.6, 10.6, 10.3, and 9.2 times ten to the negative seventeenth power cm squared, with estimated accuracy of plus or minus 25%. Problems in distinguishing between Cl-35 and Cl-37 absorption are also considered.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Chemical Physics Letters; 50; Aug. 15
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  • 2
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    Channel specific rate constants for reactions of O(1D) with HCl and HBr (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The absolute rate coefficients and product yields for reactions of O(1D) with HCl(1) and HBr(2) at 287 K are presently determined by means of the time-resolved resonance fluorescence detection of O(3P) and H(2S) in conjunction with pulsed laser photolysis of O3/HX/He mixtures. Total rate coefficients for O(1D) removal are found to be, in units of 10 to the -10th cu cm/molecule per sec, k(1) = 1.50 + or - 0.18 and k(2) 1.48 + or - 0.16; the absolute accuracy of these rate coefficients is estimated to be + or - 20 percent.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: IN: Journal of Chemical Physics (ISSN 0021-9606); 84; 1349-135
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  • 3
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    Pulsed laser photolysis kinetics study of the O(3P) + ClO reaction (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A pulsed laser photolysis technique was used to investigate the kinetics of the important stratospheric reaction O + ClO yields Cl + O2 in buffer gas over the temperature and pressure ranges of 231-367 K and 25-500 torr. The results indicate a lack of pressure dependence at 298 K over the 25-500 torr range.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 89; 5670-567
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  • 4
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    Kinetics and thermochemistry of ClCO formation from the Cl + CO association reaction (1990)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 92; 3539-354
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  • 5
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    Temperature-dependent absorption cross sections for hydrogen peroxide vapor (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Relative absorption cross sections for hydrogen peroxide vapor were measured over the temperature ranges 285-381 K for lambda = 230 nm-295 nm and 300-381 K for lambda = 193 nm-350 nm. The well established 298 K cross sections at 202.6 and 228.8 nm were used as an absolute calibration. A significant temperature dependence was observed at the important tropospheric photolysis wavelengths lambda over 300 nm. Measured cross sections were extrapolated to lower temperatures, using a simple model which attributes the observed temperature dependence to enhanced absorption by molecules possessing one quantum of O-O stretch vibrational excitation. Upper tropospheric photodissociation rates calculated using the extrapolated cross sections are about 25 percent lower than those calculated using currently recommended 298 K cross sections.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 2417-242
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