A model study of the potential role of the reaction BrO + OH in the production of stratospheric HBr

Chipperfield, Martyn P.; Shallcross, Dudley E.; Lary, D. J.

doi:10.1029/97gl53155

Cited by 18 publications

(19 citation statements)

References 17 publications

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“…In addition to the strong interest in these mechanistic details, the reaction OH + HBr → H 2 O + Br H • 0 = −131.5 kJ mol −1 (1) has been of particular interest to atmospheric chemists because it plays a significant role in the bromine partitioning of the terrestrial atmosphere [1]. This reaction represents the dominant sink for HBr in the middle to lower stratosphere [2]. At temperatures below 200 K, the rate of OH loss in the presence of HBr shows a strong inverse temperature dependence, increasing by a factor of three between 150 and 20 K. As a result of atmospheric and fundamental interest in this reaction, there have been many varied kinetic studies of the rate in the past.…”

Section: Introductionmentioning

confidence: 99%

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H₂O + Br

Jaramillo

Gougeon

Picard

et al. 2002

Int J of Chemical Kinetics

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The temperature dependence of the rate coefficient for the reaction, OH + HBr has been reinvestigated at low temperatures (T = 48-224 K) by using uniform supersonic flow reactors with laser induced fluorescence detection. This paper presents two forms of global fits: k(T) = 1.11 × 10 −11 (T/298) −0.91 cm 3 s −1 and k(T) = 1.06 × 10 −11 (T/298) −1.09 exp( −10.5 K T ) cm 3 s −1 , both of which accurately describe the temperature dependence of the rate coefficient for the title reaction within the temperature range 20-350 K. These fits indicate that at temperatures below 200 K, the rate coefficient for this reaction shows inverse temperature dependence, while above 200 K the reaction shows insignificant temperature dependence.

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Section: Introductionmentioning

confidence: 99%

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H₂O + Br

Jaramillo

Gougeon

Picard

et al. 2002

Int J of Chemical Kinetics

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“…The potential occurrence of channel 2b is of great importance for the stratospheric bromine partitioning. , Hence, the experimental determination of the branching ratio for channel 2b is required. From the unique study of reaction 2, and considering that the branching ratio of channel 2b is likely to be as low as a few percentages, it appears that one cannot neglect the side and secondary processes involved in the reactive system used to produce OH and BrO radicals.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of OH + OH and OD + OD Reactions

1999

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The kinetics of the disproportionation reactions of OH and OD radicals, OH + OH → O + H2O (1), OD + OD → O + D2O (3), have been studied by the mass spectrometric discharge-flow method at temperatures between 233 and 360 K and at total pressure of 1 Torr of helium. The following Arrhenius expressions were obtained: k 1 = (7.1 ± 1.0) × 10-13exp[(210 ± 40)/T] and k 3 = (2.5 ± 0.5) × 10-13exp[(170 ± 60)/T] cm3 molecule-1 s-1. Reaction 4 between OH and OD radicals was also investigated and the same rate constant as for reaction 1 was measured. Both the observed temperature dependence of k 1 and the measured kinetic isotopic effect (k 1/k 3) are compatible with the mechanism proposed in a previous theoretical study (Harding, L. B.; Wagner, A. F. 22nd International Symposium on Combustion, 1988). In addition, a temperature-independent rate coefficient of (1.20 ± 0.25) × 10-10 cm3 molecule-1 s-1 was measured for the reaction D + NO2 → OD + NO in the temperature range 230−365 K.

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“…: Br ϩ HOBr (1) 2 This reaction has been also used in the laboratory as a source of HOBr, which is an important species in the atmospheric bromine/ozone chemistry [1]. Recent model calculations [2,3] have shown that the reaction between OH and BrO radicals may play an important role in the stratospheric bromine partitioning. This reaction may proceed following two channels:…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of the reactions of Br2 with OH and OD

Bedjanian¹,

Bras²,

Poulet³

1999

Int. J. Chem. Kinet.

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The kinetics of the reactions OH ϩ Br 2 : HOBr ϩ Br (1) and OD ϩ Br 2 : DOBr ϩ Br (3) have been studied in the temperature range 230-360 K and at total pressure of 1 Torr of helium using the discharge-flow mass spectrometric method. The following Arrhenius expressions were obtained either from the kinetics of product formation (HOBr, DOBr) in excess of Br 2 over OH and OD or from the kinetics of Br 2 consumption in excess of OH and OD:For the reaction channels of the title reactions: OH ϩ Br 2 : BrO ϩ HBr and OD ϩ Br 2 : BrO ϩ DBr, the upper limits of the branching ratios were found to be 0.03 and 0.02 at T ϭ 320 K, respectively.

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A model study of the potential role of the reaction BrO + OH in the production of stratospheric HBr

Abstract: Abstract.We produce HBr with around 1-2% yield then this reaction will dominate HBr production between 20-35 km. As the main loss of HBr is reaction with OH this will lead to steady state HBr:BrO partitioning which is independent of other species, and temperature.

Cited by 18 publications

References 17 publications

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H₂O + Br

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H₂O + Br

Kinetic Study of OH + OH and OD + OD Reactions

Kinetic study of the reactions of Br2 with OH and OD

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A model study of the potential role of the reaction BrO + OH in the production of stratospheric HBr

Abstract: Abstract.We produce HBr with around 1-2% yield then this reaction will dominate HBr production between 20-35 km. As the main loss of HBr is reaction with OH this will lead to steady state HBr:BrO partitioning which is independent of other species, and temperature.

Cited by 18 publications

References 17 publications

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H2O + Br

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H2O + Br

Kinetic Study of OH + OH and OD + OD Reactions

Kinetic study of the reactions of Br2 with OH and OD

Contact Info

Product

Resources

About

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H₂O + Br

A consensus view of the temperature dependence of the gas phase reaction: OH + HBr → H₂O + Br