Hydroxyl radical (OH) yields from the ozonolysis of both double bonds for five monoterpenes |
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| Authors: | Frank Herrmann Richard Winterhalter Geert K Moortgat Jonathan Williams |
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| Institution: | 1. Department of Chemistry, Pusan National University, Pusan 609-735, Republic of Korea;2. Department of Chemistry, Chonbuk National University, Jeonju 561-756, Republic of Korea;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;2. Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200041, China;3. Center of Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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| Abstract: | A new method has been applied to determine OH-radical yields from the ozonolysis of both double bonds from five selected, atmospherically relevant monoterpenes, namely terpinolene, α-phellandrene, limonene, α-terpinene and γ-terpinene. While OH-yields for the faster reacting double bond agreed with previous literature values, the yields from the second double bond were determined for the first time and are as follows: limonene 7–10%, terpinolene 39–48%, α-phellandrene 8–11% and α-terpinene 12–14%. Only for γ-terpinene the rate coefficient for the reaction of ozone with the two double bonds was too similar in order to distinguish the OH-yield with this method. In all cases the yield from the second double bond was significantly lower than the first. The reasons for this difference are discussed in terms of the Criegee-intermediate reactions, in particular the number of abstractable H-atoms and the number of possible hydroperoxide products. |
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