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Top: time profiles of ion signals detected during the 1-nitrosopiperazine (PZNO) photolysis experiment on 2016.09.20. Only ion signals increasing by more than 1% of the m/z 116.079 [PZNO]H+ ion signal decrease are included. Drift tube electric field: E/N = 65 Td. Bottom: Derived volume mixing ratios (ppbV) of 1-nitrosopiperazine (PZNO), 1-nitropiperazine (PZNO2), and 1,2,3,6-tetrahydropyrazine (PZI) during the experiment.
