OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION
$^{a}$Support by NSF Collaborative Research in Chemistry grant is gratefully acknowledged. Author Institution: School of Physical Sciences, Department of Chemistry, University of California; School of Physical Sciences, Department of Chemistry, EPRI; The Henry Samueli School of Engineering, Departme...
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ftohiostateu:oai:kb.osu.edu:1811/21145 2024-06-02T08:02:38+00:00 OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION Roeselova, Martina Hunt, S. W. Wang, Weihong Wingen, Lisa M. Knipping, Eladio M. Dabdub, Donald Tobias, Douglas J. Finlayson-Pitts, Barbara J. 2004 553911 bytes image/jpeg http://hdl.handle.net/1811/21145 English eng Ohio State University 2004-FB-01 http://hdl.handle.net/1811/21145 article 2004 ftohiostateu 2024-05-06T11:02:08Z $^{a}$Support by NSF Collaborative Research in Chemistry grant is gratefully acknowledged. Author Institution: School of Physical Sciences, Department of Chemistry, University of California; School of Physical Sciences, Department of Chemistry, EPRI; The Henry Samueli School of Engineering, Department of Mechanical and Aerospace Engineering, University of California; School of Physical Sciences, Department of Chemistry, University of California The release of Br atoms from photolyzable bromine species, such as $Br_{2}$, is responsible for the almost complete destruction of ground-level ozone observed in the Arctic after polar sunrise, and is likely to play a role in the partial destruction of ozone observed in the marine boundary layer at mid-latitudes. To investigate the mechanism of the reactions of $O_{3}$ with NaBr aerosol, experiments were carried out at room temperature and atmospheric pressure in a 561 L aerosol chamber above the deliquescence point of NaBr aerosol. Fourier transform infrared spectroscopy was used to measure the concentrations of $O_{3}$ and molecular bromine concentrations were monitored using atmospheric pressure chemical ionization mass spectrometry. A computer kinetics model, including gas and aqueous phase chemical reactions, gas and aqueous phase diffusion, and mass transfer between the liquid aerosol droplets and the gas phase, was used to evaluate the mechanism for bromine production. Experimental results are not reproduced well by known gas phase and aqueous phase bromine chemistry alone, and thus, a reaction occurring at the air-water interface between gaseous ozone and aqueous bromide ion to produce $Br_{2}$ via an $O_{3}\cdots Br^{-}$ surface complex is proposed. With the inclusion of this interface reaction, the model satisfactorily reproduces experimental results. While there is no direct spectroscopic evidence of the surface complex, molecular dynamics simulations provide further support for the proposed heterogeneous reaction mechanism. They show that $O_{3}$ strongly ... Article in Journal/Newspaper Arctic Ohio State University (OSU): Knowledge Bank Arctic |
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Ohio State University (OSU): Knowledge Bank |
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$^{a}$Support by NSF Collaborative Research in Chemistry grant is gratefully acknowledged. Author Institution: School of Physical Sciences, Department of Chemistry, University of California; School of Physical Sciences, Department of Chemistry, EPRI; The Henry Samueli School of Engineering, Department of Mechanical and Aerospace Engineering, University of California; School of Physical Sciences, Department of Chemistry, University of California The release of Br atoms from photolyzable bromine species, such as $Br_{2}$, is responsible for the almost complete destruction of ground-level ozone observed in the Arctic after polar sunrise, and is likely to play a role in the partial destruction of ozone observed in the marine boundary layer at mid-latitudes. To investigate the mechanism of the reactions of $O_{3}$ with NaBr aerosol, experiments were carried out at room temperature and atmospheric pressure in a 561 L aerosol chamber above the deliquescence point of NaBr aerosol. Fourier transform infrared spectroscopy was used to measure the concentrations of $O_{3}$ and molecular bromine concentrations were monitored using atmospheric pressure chemical ionization mass spectrometry. A computer kinetics model, including gas and aqueous phase chemical reactions, gas and aqueous phase diffusion, and mass transfer between the liquid aerosol droplets and the gas phase, was used to evaluate the mechanism for bromine production. Experimental results are not reproduced well by known gas phase and aqueous phase bromine chemistry alone, and thus, a reaction occurring at the air-water interface between gaseous ozone and aqueous bromide ion to produce $Br_{2}$ via an $O_{3}\cdots Br^{-}$ surface complex is proposed. With the inclusion of this interface reaction, the model satisfactorily reproduces experimental results. While there is no direct spectroscopic evidence of the surface complex, molecular dynamics simulations provide further support for the proposed heterogeneous reaction mechanism. They show that $O_{3}$ strongly ... |
format |
Article in Journal/Newspaper |
author |
Roeselova, Martina Hunt, S. W. Wang, Weihong Wingen, Lisa M. Knipping, Eladio M. Dabdub, Donald Tobias, Douglas J. Finlayson-Pitts, Barbara J. |
spellingShingle |
Roeselova, Martina Hunt, S. W. Wang, Weihong Wingen, Lisa M. Knipping, Eladio M. Dabdub, Donald Tobias, Douglas J. Finlayson-Pitts, Barbara J. OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION |
author_facet |
Roeselova, Martina Hunt, S. W. Wang, Weihong Wingen, Lisa M. Knipping, Eladio M. Dabdub, Donald Tobias, Douglas J. Finlayson-Pitts, Barbara J. |
author_sort |
Roeselova, Martina |
title |
OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION |
title_short |
OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION |
title_full |
OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION |
title_fullStr |
OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION |
title_full_unstemmed |
OXIDATION OF NaBr AEROSOL BY OZONE: IMPORTANCE OF A SURFACE REACTION |
title_sort |
oxidation of nabr aerosol by ozone: importance of a surface reaction |
publisher |
Ohio State University |
publishDate |
2004 |
url |
http://hdl.handle.net/1811/21145 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
2004-FB-01 http://hdl.handle.net/1811/21145 |
_version_ |
1800747118531444736 |