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Science 17 April 2009:
Vol. 324. no. 5925, p. 336
DOI: 10.1126/science.1166877
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Technical Comments

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

Shuping Li, Jamie Matthews, Amitabha Sinha*

Carr et al. failed to detect hydroxyl radical formation from the reaction of excited state nitrogen dioxide with water, contrary to our findings. We present several reasons, based on energetic and spectroscopic considerations, why the OH radicals we observed from this reaction are not likely to be due to multiphoton excitation as they suggest.

Department of Chemistry and Biochemistry, University of California–San Diego, 9500 Gilman Drive, La Jolla, CA 92093–0314, USA.

* To whom correspondence should be addressed. E-mail: asinha{at}ucsd.edu

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