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. A novel chemical ionization inlet named the Multi-scheme chemical IONization inlet (MION), Karsa Ltd., Helsinki,Finland) capable of fast switching between multiple reagent ion schemes ispresented, and its performance is demonstrated by measuring several knownoxidation products from much-studied cyclohexene and α -pineneozonolysis systems by applying consecutive bromide ( Br− ) and nitrate( NO 3 - ) chemical ionization. Experiments were performed in flowtube reactors under atmospheric pressure and room temperature (22  ∘ C) utilizing an atmospheric pressure interface time-of-flight mass spectrometer (APi-ToF-MS, Tofwerk Ltd., Thun, Switzerland) as the detector.The application of complementary ion modes in probing the same steady-statereaction mixture enabled a far more complete picture of the detailedautoxidation process; the HO2 radical and the least-oxidized reactionproducts were retrieved with Br− ionization, whereas the highest-oxidized reaction products were detected in the NO 3 - mode,directly providing information on the first steps and on the ultimate endpoint ofoxidation, respectively. While chemical ionization inlets with multiplereagent ion capabilities have been reported previously, an application inwhich the charging of the sample occurs at atmospheric pressure withpractically no sample pretreatment, and with the potential to switch thereagent ion scheme within a second timescale, has not been introducedpreviously. Also, the ability of bromide ionization to detecthighly oxygenated organic molecules (HOM) from atmospheric autoxidation reactions has not been demonstratedprior to this investigation.

atmospheric measurement techniques

Multi-scheme chemical ionization inlet (MION) for fast switching of reagent ion chemistry in atmospheric pressure chemical ionization mass spectrometry (CIMS) applications