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Issue 37, 2009
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A comparison of infrared spectroscopic methods for the study of heterogeneous reactions occurring on atmospheric aerosol proxies

Deborah J. Last,a  Juan J. Nájera,b  Carl J. Percivalb  and  Andrew B. Horn*a 
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* Corresponding authors

a School of Chemistry, University of Manchester, Oxford Rd, Manchester, UK
E-mail: andrew.b.horn@manchester.ac.uk
Fax: +44 (0)161 275 4598
Tel: +44 (0)161 275 4618

b School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Rd, Manchester, UK
Fax: +44 (0)161 306 9361
Tel: +44 (0)161 306 3945

Abstract

In this paper, the heterogeneous reaction between oleic acid and ozone has been studied using infrared spectroscopy in two distinctly different experimental configurations. The effect of the experiment on the observed products and rates of reaction is compared in order to derive a better understanding of some of the variations in oleic acid reaction rates reported by a range of researchers. One set of measurements is made using thin films of oleic acid in an attenuated total internal reflection configuration, and it is shown that a treatment in which the ATR evanescent wave is convolved with a moving reaction front is essential for the extraction of reliable kinetic data. The results are compared to similar measurements in a recently developed aerosol flow tube equipped with a cross-beam infrared spectroscopic probe. Rates of reaction in the aerosol phase are observed to be approximately 10 times faster and possible reasons for this discussed.

Graphical abstract: A comparison of infrared spectroscopic methods for the study of heterogeneous reactions occurring on atmospheric aerosol proxies

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Publication details

The article was received on 28 Jan 2009, accepted on 26 May 2009 and first published on 29 Jun 2009


Article type: Paper
DOI: 10.1039/B901815H
Citation: Phys. Chem. Chem. Phys., 2009,11, 8214-8225
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    A comparison of infrared spectroscopic methods for the study of heterogeneous reactions occurring on atmospheric aerosol proxies

    D. J. Last, J. J. Nájera, C. J. Percival and A. B. Horn, Phys. Chem. Chem. Phys., 2009, 11, 8214
    DOI: 10.1039/B901815H

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