Kinetics of reactions between free radicals and surfaces (aerosols) applicable to atmospheric chemistry

Jech, Daryl D.; Easley, Patrick G.; Krieger, Barbara B.

doi:10.1029/gm026p0107

Cited by 15 publications

(10 citation statements)

References 55 publications

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“…Charneides and Davis, 1982]. Note, for instance, in this regard that measurements of •,•(H20), the accommodation coefficient for water vapor impinging upon 5331 [Jech, 1981]. As long as •w(NO3) is equal to or greater than 0.01, the rate of scavenging of NO 3 by droplets in a cloud is quite rapid.…”

Section: No 3 Scavenging and Nitric Acid Productionmentioning

confidence: 99%

Possible role of NO₃ in the nighttime chemistry of a cloud

Chameides

1986

J. Geophys. Res.

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Section: No 3 Scavenging and Nitric Acid Productionmentioning

confidence: 99%

Possible role of NO₃ in the nighttime chemistry of a cloud

Chameides

1986

J. Geophys. Res.

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“…If a is less than about 10 -2 , then the rates of processes occurring in cloud droplets become sensitive to this parameter [Chameides and Davis, 1982]. Golden, 1979, 1980;Harker and Ho, 1979], flow tube reactor walls [Martin et al., 1980], and dry salt particles [Jech et al, 1982]. However, values of a near unity are observed for vapors on their own liquids [Pound, 1972;Mozurkewich, 1986] and for NH3 on liquid H2SO4 particles [Huntzicker et al, 1980;McMurry et al, 1983].…”

Section: Introductionmentioning

confidence: 99%

Mass accommodation coefficient for HO₂ radicals on aqueous particles

Mozurkewich¹,

McMurry²,

Gupta³

et al. 1987

J. Geophys. Res.

178

136

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The rate of reaction of gas phase HO2 radicals with a monodisperse, submicrometer aerosol was measured in a flow tube reactor at atmospheric pressure. At the relative humidity of the experiments (75%), the aerosol consisted of concentrated solution droplets of either LiNO3 or NH4HSO4. When the aerosol contained a sufficient amount of Cu(II) ions, reaction of HO2 with the aerosol was observed. The mass accommodation coefficient for HO2 on aqueous particles was determined to be greater than 0.2. This implies that in clouds HO2 mass transport will be limited by gas-phase diffusion and HO2 will be in equilibrium at the gas-liquid interface. Reactions of HO2 with Cu(I) and Cu(II) ions in submicrometer aerosols may have a significant role in converting atmospheric odd hydrogen radicals into H202.

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“…Baldwin and Golden (1979) on sulfuric acid and the OH interaction with NaN0 3 (Jech et al, 1982). The actual rate will vary as the aerosol surface characteristics and size distribution change.…”

mentioning

confidence: 99%

The dynamics of nitric acid production and the fate of nitrogen oxides

Russell

McRae

Cass

1985

Atmospheric Environment (1967)

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A mathematical model is used to study the fate of nitrogen oxides (NO ) emissions and the reactions responsible for the formation of nit~ic acid (HN0 3). Model results indicate that the majority of the NO inserted into an air parcel in the Los Angeles basin is removed by drJ deposition at the ground during the first 24 hours of travel, and that HN0 3 is the largest single contributor to this deposition flux. A significant amount of the nitric acid is produced at night by N 2 o 5hydrolysis. Perturbation of the N 2 o~ hydrolysis rate constant within the chemical mechanism results in reaistribution of the pathway by which HN0 3 is formed, but does not greatly affect the total amount of HN0 1 produced. Inclusion of N0 1 -aerosol and N 2 o 5 -aerosol reactions doe! not affect the system grea~ly at collision ~fficiencies, a, of 0.001, but at a • 0.1 or a •1.0, a great deal of nitric acid could be produced by heterogeneous chemical processes.Ability to account for the observed nitrate radical (No 3 ) concentrations in the atmosphere provides a key test of the air quality modeling procedure. Predicted N0 3 concentrations compare well with those measured by Platt et al. (1980). Analysis shows that transport, deposition and emissions, as well as chemistry, are important in explaining the behavior of N0 3 in the atmosphere.

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Kinetics of reactions between free radicals and surfaces (aerosols) applicable to atmospheric chemistry

Cited by 15 publications

References 55 publications

Possible role of NO₃ in the nighttime chemistry of a cloud

Possible role of NO₃ in the nighttime chemistry of a cloud

Mass accommodation coefficient for HO₂ radicals on aqueous particles

The dynamics of nitric acid production and the fate of nitrogen oxides

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Kinetics of reactions between free radicals and surfaces (aerosols) applicable to atmospheric chemistry

Cited by 15 publications

References 55 publications

Possible role of NO3 in the nighttime chemistry of a cloud

Possible role of NO3 in the nighttime chemistry of a cloud

Mass accommodation coefficient for HO2 radicals on aqueous particles

The dynamics of nitric acid production and the fate of nitrogen oxides

Contact Info

Product

Resources

About

Possible role of NO₃ in the nighttime chemistry of a cloud

Possible role of NO₃ in the nighttime chemistry of a cloud

Mass accommodation coefficient for HO₂ radicals on aqueous particles