UV absorption cross sections of HO2NO2 vapor |
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| Affiliation: | 1. School of Environment, The University of Auckland, Private Bag 92019, Auckland, New Zealand;2. Anthropology, School of Social Science, The University of Auckland, Private Bag 92019, Auckland, New Zealand;1. George Washington University School of Medicine, Washington, DC, USA;2. InClin, San Mateo, CA, USA;3. Merck & Co, Inc., Kenilworth, NJ, USA;1. State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China;2. Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing 100029, China |
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| Abstract: | The UV absorption cross sections for gas phase pernitric acid (HO2NO2) were measured between 190 and 330 nm at 298 K and 1 atm total pressure. The HO2NO2 vapor was prepared in a flowing stream of nitrogen in the presence of H2O, H2O2, HNO3 and NO2. The composition of the mixture was established by visible and IR absorption spectroscopy and by chemical titration after absorption in aqueous solutions. The HO2NO2 cross sections ranged from approximately 10−17 cm2 molecule−1 at 190 nm to about 10−21 cm2 molecule−1 at 330 nm. The experimental uncertainty (one standard deviation) ranged from 5% at 200 nm to 30% at 330 nm and fell mainly in the 10% range. The solar photodissociation rate in the troposphere and lower stratosphere was estimated to be about 10−5 s−1 for a solar zenith angle of 0°. |
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