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Science 17 April 2009:
Vol. 324. no. 5925, p. 336
DOI: 10.1126/science.1166669
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Technical Comments

Comment on "Atmospheric Hydroxyl Radical Production from Electronically Excited NO2 and H2O"

Scott Carr,1 Dwayne E. Heard,1 Mark A. Blitz1,2*

Li et al. (Reports, 21 March 2008, p. 1657) suggested that the reaction between electronically excited nitrogen dioxide and water vapor is an important atmospheric source of the hydroxyl radical. However, under conditions that better approximate the solar flux, we find no evidence for OH production from this reaction.

1 School of Chemistry, University of Leeds, Leeds LS2 9JT, UK.
2 National Centre for Atmospheric Science, School of Chemistry, University of Leeds, Leeds LS2 9JT, UK.

* To whom correspondence should be addressed. E-mail: m.blitz{at}leeds.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)