Rapid Autoxidation Forms Highly Oxidized RO2Radicals in the Atmosphere
| Autor: | Hartmut Herrmann, Douglas R. Worsnop, Markku Kulmala, Mikko Sipilä, Tuija Jokinen, Mikael Ehn, Stefanie Richters, Pauli Paasonen, Torsten Berndt, Veli-Matti Kerminen, Frank Stratmann |
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| Rok vydání: | 2014 |
| Předmět: |
Ozone
010504 meteorology & atmospheric sciences Autoxidation Radical Sulfuric acid General Chemistry 010501 environmental sciences Photochemistry 01 natural sciences 7. Clean energy Catalysis Atmosphere chemistry.chemical_compound chemistry 13. Climate action Intramolecular force Atmospheric chemistry Organic chemistry Isoprene 0105 earth and related environmental sciences |
| Zdroj: | Angewandte Chemie International Edition. 53:14596-14600 |
| ISSN: | 1433-7851 |
| DOI: | 10.1002/anie.201408566 |
| Popis: | Gas-phase oxidation routes of biogenic emissions, mainly isoprene and monoterpenes, in the atmosphere are still the subject of intensive research with special attention being paid to the formation of aerosol constituents. This laboratory study shows that the most abundant monoterpenes (limonene and α-pinene) form highly oxidized RO2 radicals with up to 12 O atoms, along with related closed-shell products, within a few seconds after the initial attack of ozone or OH radicals. The overall process, an intramolecular ROO→QOOH reaction and subsequent O2 addition generating a next R'OO radical, is similar to the well-known autoxidation processes in the liquid phase (QOOH stands for a hydroperoxyalkyl radical). Field measurements show the relevance of this process to atmospheric chemistry. Thus, the well-known reaction principle of autoxidation is also applicable to the atmospheric gas-phase oxidation of hydrocarbons leading to extremely low-volatility products which contribute to organic aerosol mass and hence influence the aerosol-cloud-climate system. |
| Databáze: | OpenAIRE |
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