Articles | Volume 11, issue 8
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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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.