Laboratory study of the interaction of HO2 radicals with the NaCl, NaBr, MgCl2·6H2O and sea salt surfaces

Literature Information

Publication Date 2009-06-18
DOI 10.1039/B906300E
Impact Factor 3.676
Authors

Ekaterina Loukhovitskaya, Yuri Bedjanian, Igor Morozov, Georges Le Bras


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Abstract

The uptake of HO2 radicals on synthetic sea salt, NaCl, NaBr and MgCl2·6H2O dry solid films was studied over the temperature range 240 to 340 K and at 1 Torr pressure of helium using a discharge flow reactor coupled to a modulated molecular beam mass spectrometer. The Arrhenius expressions (calculated with geometric surface area) were obtained for the uptake coefficient of HO2: 3.1 × 10−9 exp[(3990 ± 200)/T], 2.2 × 10−8 exp[(3340 ± 180)/T], 1.2 × 10−8 exp[(3570 ± 180)/T] and 3.8 × 10−5 exp[(1710 ± 60)/T] on sea salt, NaCl, NaBr and MgCl2·6H2O, respectively (quoted uncertainty is 2σ statistical). H2O2 was observed as a main product of HO2 interaction with salt surface indicating a heterogeneous HO2 self reaction mechanism. The results show that the HO2 loss through heterogeneous interaction with salt surface is not sufficiently rapid to explain the observed differences between modeled and measured HO2 concentrations in remote coastal areas.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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