Articles | Volume 11, issue 8
https://doi.org/10.5194/amt-11-4763-2018
https://doi.org/10.5194/amt-11-4763-2018
Research article
 | 
14 Aug 2018
Research article |  | 14 Aug 2018

Production of highly oxygenated organic molecules (HOMs) from trace contaminants during isoprene oxidation

Anne-Kathrin Bernhammer, Lukas Fischer, Bernhard Mentler, Martin Heinritzi, Mario Simon, and Armin Hansel

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Cited articles

Berndt, T., Richters, S., Kaethner, R., Voigtländer, J., Stratmann, F., Sipilä, M., Kulmala, M., and Herrmann, H.: Gas-Phase Ozonolysis of Cycloalkenes: Formation of Highly Oxidized RO3 Radicals and Their Reactions with NO, NO2, SO2, and Other RO3 Radicals, J. Phys. Chem., 119, 10336–10348, https://doi.org/10.1021/acs.jpca.5b07295, 2015. 
Berndt, T., Herrmann, H., Sipilä, M., and Kulmala, M.: Highly Oxidized Second-Generation Products from the Gas-Phase Reaction of OH Radicals with Isoprene, J. Phys. Chem., 120, 10150–10159, https://doi.org/10.1021/acs.jpca.6b10987, 2016a. 
Berndt, T., Richters, S., Jokinen, T., Hyttinen, N., Kurtén, T., Otkjær, R. V., Kjaergaard, H. G., Stratmann, F., Herrmann, H., Sipilä, M., Kulmala, M., and Ehn, M.: Hydroxyl radical-induced formation of highly oxidized organic compounds, Nature Comm., 7, 13677, https://doi.org/10.1038/ncomms13677, 2016b. 
Berndt, T., Mentler, B., Scholz, W., Fischer, L., Herrmann, H., Kulmala, M., and Hansel, A.: Accretion Product Formation from Ozonolysis and OH Radical Reaction of α-Pinene: Mechanistic Insight and the Influence of Isoprene and Ethylene, Environ. Sci. Technol., under review, 2018b. 
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Short summary
During new particle formation (NPF) studies from pure isoprene oxidation in the CLOUD chamber at CERN we observed unexpected ion signals. We identified two origins of these signals: first secondary association reactions of protonated isoprene with isoprene within the PTR3 reaction chamber and, second, polymerization of isoprene inside the gas bottle. In order to study NPF from pure isoprene oxidation we had to install a cryogenic trap in the isoprene inlet line to remove polymerized isoprene.