Technical Comments

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

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Science  17 Apr 2009:
Vol. 324, Issue 5925, pp. 336
DOI: 10.1126/science.1166877

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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.

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