Journal ArticleDOI
A temperature dependence kinetics study of the reactions of Cl (2P3/2) with O3, CH4, and H2O2
TLDR
In this article, the temperature dependence of two chlorine atom reactions of considerable fundamental importance to stratospheric chemistry was studied using the technique of flash photolysis-resonance fluorescence.Abstract:
The temperature dependence of two chlorine atom reactions of considerable fundamental importance to stratospheric chemistry was studied using the technique of flash photolysis-resonance fluorescence. The reactions of interest were: (1) Cl + O3 yields ClO + O2 studied at 220-350 K, and (2) Cl + CH4 yields CH3 + HCl studied at 218-401 K. In addition, the reaction Cl + H2O2 yields HCl + HO2 was studied at 300 K. The corresponding rate constants are provided for the three reactions. The new rate data implies the need to revise downward by a factor of 2.4-3 the magnitude of the ozone perturbation due to the presence of ClO/x/ species in the stratosphere, predicted by earlier model calculations.read more
Citations
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Journal ArticleDOI
Halogen oxides: Radicals, sources and reservoirs in the laboratory and in the atmosphere
Richard P. Wayne,G. Poulet,P. Biggs,John P. Burrows,R. A. Cox,Paul J. Crutzen,Garry Hayman,Michael E. Jenkin,G. Le Bras,Geert K. Moortgat,Ulrich Platt,Ralph N. Schindler +11 more
TL;DR: In this article, a review of the relationship between the laboratory investigations and the atmospheric studies is presented, focusing on gas-phase processes of halogen oxides and their precursors in the laboratory and the atmosphere.
Journal ArticleDOI
Atomic Chlorine and the Chlorine Monoxide Radical in the Stratosphere: Three in situ Observations.
TL;DR: Three simultaneous observations of atomic chlorine and the chlorine monoxide radical are reported which encompass the altitude interval between 25 and 45 kilometers, implying that chlorine compounds constitute an important part of the stratospheric ozone budget.
Journal ArticleDOI
Kinetics of Reactions of Cl Atoms with Methane and Chlorinated Methanes
TL;DR: In this article, a transition state theory reaction model based on ab initio calculations, the Marcus expression for correlation between reaction barriers and reaction energetics, and analysis of experimental data is presented.
Journal ArticleDOI
A laser flash photolysis‐resonance fluorescence kinetics study of the reaction Cl(2P) + CH4→CH3 + HCl
A. R. Ravishankara,Paul H. Wine +1 more
TL;DR: The technique of laser flash photolysis‐resonance fluorescence is employed to study the kinetics of the reaction Cl(2P) + CH4→CH3+HCl over the temperature range 221–375 K, finding the bimolecular rate constant is independent of methane concentration with k1?k1L and k1H.
Journal ArticleDOI
Infrared measurements of the ClO radical
James B. Burkholder,James B. Burkholder,Philip D. Hammer,Philip D. Hammer,Carleton J. Howard,Carleton J. Howard,Arthur G. Maki,G. A. Thompson,Charles Chackerian +8 more
TL;DR: In this paper, high-resolution infrared spectra of the fundamental and first overtone bands of the ClO ( X 2 Π 3 2, 2 − 1 2 ) radical have been observed using a Fourier transform spectrometer and a diode laser.
References
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Journal ArticleDOI
Chlorofluoromethanes in the Environment
F. S. Rowland,Mario J. Molina +1 more
TL;DR: In this article, the photoprocesses of atmospheric chlorofluoromethanes, including their ultimate sinks, are studied. Butt et al. present a detailed study of the photodissociation process of chlorofluromethane.
Journal ArticleDOI
Critical review of ultraviolet photoabsorption cross sections for molecules of astrophysical and aeronomic interest.
TL;DR: In this article, a critical review of photo absorption cross sections for molecules of aeronomic and astrophysical interest at wavelengths less than 3000 A is devoted to a discussion of the relative merits of various experimental techniques along with possible systematic and random errors that may be associated with them.
Journal ArticleDOI
Stratospheric ozone destruction by man-made chlorofluoromethanes.
TL;DR: Present usage levels of chlorofluoromethanes can lead to chlorine-catalyzed ozone destruction rates that will exceed natural sinks of ozone by 1985 or 1990.
Journal ArticleDOI
HOx, NOx, and ClOx: Their Role in Atmospheric Photochemistry
TL;DR: In this article, sources of atmospheric odd nitrogen and hydrogen are reviewed and their role m ozone photochemistry is discussed, and a model, containing few adjustable parameters, gives good agreement with observed d...