Pressure and temperature dependence kinetics study of the NO + BrO. -->. NO/sub 2/ + Br reaction. Implications for stratospheric bromine photochemistry

Journal Article · Thu Nov 01 04:00:00 EST 1979 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100486a002· OSTI ID:5844050

Watson, R T ^[1]; Sander, S P; Yung, Y L

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1. California Inst. of Tech., Pasadena

The flash photolysis-ultraviolet absorption technique has been utilized to study the reactivity of nitric oxide with BrO radicals over a wide range of pressure (100 to 700 torr) and temperature (224 to 398 K). Pseudo-first-order conditions were used in order to minimize complications caused by secondary kinetic processes. The reaction and its corresponding Arrhenius expression in units of cm/sup 3/ molecule/sup -1/ s/sup -1/ can be written NO + BrO ..-->.. NO/sub 2/ + Br, ..delta..H/sub 298//sup 0/ = -17.0 kcal mol/sup -1/, k/sub 1/ = (1.28 +- 0.23) x 10/sup -11/ exp ((181 +- 46)/T) (T = 224 to 398/sup 0/K). The results are compared with previous measurements, and atmospheric implications of the reaction are discussed. It is shown that this reaction is important in controlling the ratios (BrO)/(Br) and (BrO)/(HBr) in the stratosphere but that it does not affect the catalytic efficiency of BrO/sub x/ in ozone destruction.

• OSTI ID: 5844050
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:23; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
BROMINE COMPOUNDS
BROMINE OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
EARTH ATMOSPHERE
HALOGEN COMPOUNDS
KINETICS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
OZONE
PRESSURE DEPENDENCE
RADICALS
REACTION KINETICS
STRATOSPHERE
TEMPERATURE DEPENDENCE