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  • INORGANIC AND PHYSICAL CHEMISTRY  (12)
  • Surface physics, nanoscale physics, low-dimensional systems  (1)
  • 1
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    Quantum fluctuations stabilize skyrmion textures (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-12-24
    Description: Author(s): A. Roldán-Molina, M. J. Santander, A. S. Nunez, and J. Fernández-Rossier We study the quantum spin waves associated to skyrmion textures. We show that the zero-point energy associated to the quantum spin fluctuations of a noncollinear spin texture produce Casimir-like magnetic fields. We study the effect of these Casimir fields on the topologically protected noncollinear… [Phys. Rev. B 92, 245436] Published Wed Dec 23, 2015
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Quantum yield of chlorine-atom formation in the photodissociation of chlorine peroxide (ClOOCl) at 308 nm (1990)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The production of Cl atoms in the laser flash photolysis of ClOOCl at 308 nm has been investigated by time-resolved atomic resonance fluorescence at 235 K. A value of phi = 1.03 +/-0.12 has been obtained for the primary quantum yield based on an absorption cross section ratio sigma(245)/phi(308) = 22 for ClOOCl at 245 and 308 nm.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Chemical Physics Letters (ISSN 0009-2614); 173; 310-315
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An upper limit to the rate of the HCl + ClONO2 reaction (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The reaction HCl + ClONO2 yields Cl2 + HNO3 has been studied by Fourier transform infrared spectroscopy and by a static wall-less UV absorption technique. An upper limit to the homogeneous bimolecular rate constant of 10 to the -19th cu cm/molecule per sec was established, making the reaction unimportant in the stratosphere.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 89; 18, 1; 3779-378
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    NASA TECHNICAL REPORTS
  • 4
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    Kinetics of the reactions of SH radicals with NO2 and O2 (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The SH + NO2 reaction rate constant was measured by monitoring SH concentrations with long-path optical absorption at 324 nm in a laser photolysis system. At 298 K, the rate constant was found to be (4.8 + or - 1.0) x 10 to the -11th cu cm/molecule per sec. An upper limit of 4 x 10 to the -19th cu cm/molecule per sec was inferred for the SH + O2 reaction, indicating that the atmospheric oxidation of the SH radical may occur via reaction with species such as NO2 and O3.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 91; 4603-460
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  • 5
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    The rate of the reaction of OH with HCl (1984)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Using the techniques of laser/flash photolysis-resonance fluorescence, the absolute rate constant for the OH + HCl reaction is measured from 240 to 295 K. Ultraviolet and infrared spectrophotometry are used to continuously monitor the HCl concentrations. It is shown that the rate constant values obtained in the study are 20-30 percent larger than those recommended by Smith and Zellner (1974) and Ravishankara et al. (1977) for modeling of stratospheric chemistry.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: International Journal of Chemical Kinetics (ISSN 0538-8066); 16; 1151-116
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    NASA TECHNICAL REPORTS
  • 6
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    Pressure and temperature dependences of the reaction of OH with nitric acid (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Rate constants for the reaction of OH with HNO3 have been measured by using a laser flash photolysis resonance absorption technique at 298 and 248 K in the presence of 10-730 Torr of He, N2, and SF6. A dependence on total pressure was observed with rate constant values increasing at 298 K from 1.11 x 10 to the -13th cu cm/molecule/s at 10 Torr to 1.45 x 10 to the -13th cu cm/molecule/s at 730 Torr, and at 248 K from 1.87 x 10 to the -13th cu cm/molecule/s at 10 Torr to 3.07 x 10 to the -13th cu cm/molecule/s at 730 Torr with helium as the diluent gas. Falloff behavior occurred at lower pressures with SF6 or N2 as the diluent gas. Extrapolated zero pressure rate constants were determined and correspond to an Arrhenius activation energy of E/R = -710 K.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry (ISSN 0022-3654); 90; 12, 1; 2777-278
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    NASA TECHNICAL REPORTS
  • 7
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    Gas phase reactions of compounds of interest for stratospheric chemistry (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Washington Upper Atmosphere Res. Program; p 109-111
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  • 8
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    Production of OH from photolysis of HOCl at 307-309 nm (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Laser-induced fluorescence has been used to measure the amount of OH produced in the laser photolysis of HOCl at 310 nm. The HOCl was generated by the Cl2O + H2O and by the HCl + Cl2O reactions. The laser technique samples OH on a microsecond time scale so that secondary radical reactions cannot contribute significantly to the observed signals. The fluorescence signals were calibrated with O3-H2O mixtures, the reactions O3 + h(nu) yields O(1D) + O2 and O(1D) + H2O yields 2OH yielding known amounts of OH. The value for the absorption cross section of HOCl at 310 nm has been determined to be 6 x 10 to the -20th sq cm, assuming K(eq) = 0.082 for the Cl2O + H2O yields 2HOCl system and assuming unit quantum yield for the production of OH. The present investigation further supports earlier experimental work concluding that HOCl will photodissociate rapidly and will not be an important holding tank for chlorine in the stratosphere. These results are in disagreement with theoretical calculations of the UV absorption spectrum of HOCl in the 300-350-nm wavelength region.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry; 84; Apr. 17
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  • 9
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    Kinetics of the ClO + NO2 + M reaction (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The ClO + NO2 + M reaction has been studied with two techniques: Fourier transform infrared spectroscopy of the products, and flash photolysis-ultraviolet absorption to monitor the decay of ClO in excess NO2. The measured third-order rate constant is 1.5 x 10 to the -31st cm to the 6th/molecule-squared per sec at 298 K with M = N2, in good agreement with previous literature values, but the rate constant appears to decrease by up to a factor of three in the presence of increasing amounts of OClO. For the infrared studies a stoichiometric mixture of ClO and NO2 was prepared in a flow system by mixing NO with OClO; at least as much NO2 as ClONO2 was produced under a variety of experimental conditions. These two sets of results are incompatible with the assumption made in previous kinetic studies that ClONO2 is the only recombination product; other isomers such as OClONO or ClOONO are likely to be formed three to four times faster. These results imply that potential stratospheric ozone depletion due to chlorofluoromethanes may be even larger than previously thought.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry; 84; Nov. 13
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  • 10
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    The rate constant for the reaction of O/3P/ atoms with ClONO2 (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Experiments were conducted in a conventional fast flow apparatus to study the rate constant and the activation energy for the reaction O(3P) + ClONO2. The air-afterglow technique was used for the detection of oxygen atoms under pseudo first order conditions. A value of (3.4 plus or minus 0.6) x 10 to the -12th exp/(-840 plus or minus 60)T/cu cm/molecule/s was obtained for the rate constant. The observed rate is sufficiently slow so that oxygen atom attack is of minor importance in the stratosphere compared to photolysis.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Chemical Physics Letters; 45; Jan. 1
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