Journal ArticleDOI
A Gaskinetic Investigation of HOBr Reactions with CI(2P), O(3P) and OH(2II). The Reaction of BrCl with OH(2II)
A. Kukui,U. Kirchner,Th. Benter,Ralph N. Schindler +3 more
- Vol. 100, Iss: 4, pp 455-461
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TLDR
In this article, a mass-spectrometric detection of HOBr with atomic chlorine, with oxygen and with hydroxyl radicals at 300 K using the discharge flow technique was performed.Abstract:
The reactions of HOBr with atomic chlorine (1), with oxygen (2) and with hydroxyl radicals (3) have been investigated at 300 K using the discharge flow technique with mass-spectrometric detection. The rate constants based on HOBr consumption have been determined to be k 1 = (8.0±0.4).10 -11 and k 2 = (3.1±0.2).10 -11 . For the reaction with OH radicals k 3 < 5.10 -13 was obtained. All rate constants are given in units cm 3 molecule -1 s -1 . The reactions of HOBr with Cl and with O are shown to proceed via bromine abstraction with formation of BrCI and BrO, respectively. The predominant channel in the reaction of OH with BrCl was identified to be step (4a) OH+BrCl → HOBr+Cl (4a) Based on the present kinetic investigation the heat of formation for HOBr at T= 300 K was evaluated to be ΔH f 0 (HOBr) = - (60.22 ± 2) kJ.mol -1 .read more
Citations
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Kinetic Study of OH + OH and OD + OD Reactions
TL;DR: In this article, a mass spectrometric discharge-flow method at temperatures between 233 and 360 K and at total pressure of 1 Torr of helium was used to study the kinetics of the disproportionation reactions of OH and OD radicals.
Journal ArticleDOI
Rate coefficients for the thermal decomposition of brono2 and the heat of formation of brono2
TL;DR: In this article, the rate coefficients for the thermal decomposition of bromine nitrate were obtained at temperatures between 320 and 340 K and pressures between 100 and 1000 Torr.
Journal ArticleDOI
Experimental verification of gas phase bromine enrichment in reactions of HOBr with sea salt doped ice surfaces
TL;DR: Significant gas phase bromine enrichment is experimentally verified on flowing gaseous HOBr over ice surfaces doped with sodium halides of sea salt composition as discussed by the authors, and it is argued that formation of Br 2 Cl - in the condensed phase followed by its dissociation with release of B 2 into the gas phase accounts for this phenomenon.
Journal ArticleDOI
Nearly ab Initio Thermochemistry: The Use of Reaction Schemes. Application to IO and HOI
TL;DR: In this article, a simple criterion is suggested for estimating the accuracy to be expected from using an arbitrary reaction, and the results from different reactions may be combined in a weighted average to derive enthalpies of formation.
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The Dissociation Energy of OH(X2Π3/2) and the Enthalpy of Formation of OH(X2Π3/2), ClOH, and BrOH from Thermochemical Cycles
TL;DR: In this paper, improved values for the enthalpy of formation and dissociation energy of the hydroxyl radical have been found through the use of available experimental data and thermochemical cycles.
References
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Journal ArticleDOI
Gaussian-2 theory for molecular energies of first- and second-row compounds
TL;DR: The Gaussian-2 theoretical procedure (G2 theory) as discussed by the authors was proposed to calculate molecular energies (atomization energies, ionization potentials, and electron affinities) of compounds containing first and second-row atoms.
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Surface ozone depletion in Arctic spring sustained by bromine reactions on aerosols
Song-Miao Fan,Daniel J. Jacob +1 more
TL;DR: In this paper, the authors proposed a mechanism based on known aqueous phase chemistry, which rapidly converts HBr, HOBr and BrNO3 back to Br and BrO radicals.
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Tubular Flow Reactors With First-Order Kinetics.
TL;DR: A method is presented for automatically calculating true first order rate constants for gas phase and wall reactions from experimentally observed decay parameters in tubular flow reactors that includes the effects of axial and radial diffusion and Poiseuille flow.
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High-pressure flow kinetics - A study of the OH + HCl reaction from 2 to 100 torr
TL;DR: The discharge-flow resonance fluorescence technique has been used to obtain absolute rate data for the OH + HCl reaction at total pressures from 2 to 100 torr of helium and 2 to 25 tor r of 80% nitrogen plus 20% helium as mentioned in this paper.
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Role of the BRO + HO2 reaction in the stratospheric chemistry of bromine
TL;DR: The impact of new laboratory data for the reaction BrO + HO2 → HOBr + O2 has been estimated in a one-dimensional photochemical modelling of bromine/ozone stratospheric chemistry.