fig3

Figure 3. (A) Temporal trends in the ozonolysis of CH₃SeCH₃ reacting to dimethyl selenoxide as a multigeneration product (O₃ = 20 ppb, T = 25 °C); (B) Temporal trends in the ozonolysis of CH₃SeSeCH₃ forming the reaction product methylselenic acid (O₃ = 20 ppb, T = 25 °C)^[42]. The reactions were carried out in a 48 inch × 72 inch (W × H) thick rectangular perfluoroalkoxy alkane pillow bag, which was pre-cleaned by continuous ozone exposure (> 20 L/min filtered compressed air purge) under ultraviolet irradiation for ≥ 10 h, followed by nitrogen purging (12 L·min^-1) before each experiment. Reaction products were monitored in real time using PTR-TOF-MS. (A) and (B) are redrawn using original data from Heine and Borduas-Dedekind^[42]. This figure is reproduced with permission^[42], Copyright 2023, American Chemical Society. PTR-TOF-MS: Proton-transfer-reaction time-of-flight mass spectrometry.