Rate coefficient temperature dependence and branching ratio for the OH + ClO reaction

Alan J. Hills; Carleton J. Howard

doi:10.1063/1.447414

Rate coefficient temperature dependence and branching ratio for the OH + ClO reaction

Alan J. Hills, Carleton J. Howard

Experimental Science Section

National Oceanic and Atmospheric Administration

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

Abstract

The rate constant for the reaction OH + ClO→HO₂ + Cl (1a) →HCl + O₂ (1b) has been measured in a discharge-flow system with far infrared laser magnetic resonance detection of OH, ClO, and HO₂. Measurements were made at low pressure (1.0-1.1 Torr) and at temperatures between 219 and 373 K under pseudo-first-order conditions. The measured rate constant is k₁ = (8.0 ± 1.4) × 10^-12 exp[(235 ± 46)/T] cm³ molecule^-1 s^-1. The branching ratio at 293 K is, k_1a/k₁ = 0.86 ± 0.14. The rate constant to channel (1a) was used with that for the reverse reaction to calculate the heat of formation of HO_2.ΔH°_f,298 (HO₂) = 3.0 ± 0.4 kcal mol^-1.

Original language	English
Pages (from-to)	4458-4465
Number of pages	8
Journal	Journal of Chemical Physics
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.447414
State	Published - 1984

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title = "Rate coefficient temperature dependence and branching ratio for the OH + ClO reaction",

abstract = "The rate constant for the reaction OH + ClO→HO2 + Cl (1a) →HCl + O2 (1b) has been measured in a discharge-flow system with far infrared laser magnetic resonance detection of OH, ClO, and HO2. Measurements were made at low pressure (1.0-1.1 Torr) and at temperatures between 219 and 373 K under pseudo-first-order conditions. The measured rate constant is k1 = (8.0 ± 1.4) × 10-12 exp[(235 ± 46)/T] cm3 molecule-1 s-1. The branching ratio at 293 K is, k1a/k1 = 0.86 ± 0.14. The rate constant to channel (1a) was used with that for the reverse reaction to calculate the heat of formation of HO2.ΔH°f,298 (HO2) = 3.0 ± 0.4 kcal mol-1.",

author = "Hills, \{Alan J.\} and Howard, \{Carleton J.\}",

year = "1984",

doi = "10.1063/1.447414",

language = "English",

volume = "81",

pages = "4458--4465",

journal = "Journal of Chemical Physics",

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publisher = "American Institute of Physics",

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TY - JOUR

T1 - Rate coefficient temperature dependence and branching ratio for the OH + ClO reaction

AU - Hills, Alan J.

AU - Howard, Carleton J.

PY - 1984

Y1 - 1984

N2 - The rate constant for the reaction OH + ClO→HO2 + Cl (1a) →HCl + O2 (1b) has been measured in a discharge-flow system with far infrared laser magnetic resonance detection of OH, ClO, and HO2. Measurements were made at low pressure (1.0-1.1 Torr) and at temperatures between 219 and 373 K under pseudo-first-order conditions. The measured rate constant is k1 = (8.0 ± 1.4) × 10-12 exp[(235 ± 46)/T] cm3 molecule-1 s-1. The branching ratio at 293 K is, k1a/k1 = 0.86 ± 0.14. The rate constant to channel (1a) was used with that for the reverse reaction to calculate the heat of formation of HO2.ΔH°f,298 (HO2) = 3.0 ± 0.4 kcal mol-1.

AB - The rate constant for the reaction OH + ClO→HO2 + Cl (1a) →HCl + O2 (1b) has been measured in a discharge-flow system with far infrared laser magnetic resonance detection of OH, ClO, and HO2. Measurements were made at low pressure (1.0-1.1 Torr) and at temperatures between 219 and 373 K under pseudo-first-order conditions. The measured rate constant is k1 = (8.0 ± 1.4) × 10-12 exp[(235 ± 46)/T] cm3 molecule-1 s-1. The branching ratio at 293 K is, k1a/k1 = 0.86 ± 0.14. The rate constant to channel (1a) was used with that for the reverse reaction to calculate the heat of formation of HO2.ΔH°f,298 (HO2) = 3.0 ± 0.4 kcal mol-1.

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U2 - 10.1063/1.447414

DO - 10.1063/1.447414

M3 - Article

AN - SCOPUS:0000765795

SN - 0021-9606

VL - 81

SP - 4458

EP - 4465

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

IS - 10

ER -

Rate coefficient temperature dependence and branching ratio for the OH + ClO reaction

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