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. 2022 Dec 23;28(1):132. doi: 10.3390/molecules28010132

Figure 2.

Figure 2

ITMS spectrum showing (a) the ion–molecule reaction of isolated HCO4− ions (m/z 77) with SO2, reaction time = 200 ms, P SO2 = 1.3 × 10−7 Torr. Observed products: HSO4− at m/z 97, HSO3− at m/z 81, HCO3− at m/z 61; the signals denoted with * correspond to H34SO3− (m/z = 83) and to H34SO4− (m/z = 99); (b) the ion–molecule reaction of HCO3− ions (m/z 61) isolated from the sequence 77 → 61 with SO2 (reaction time = 200 ms, P SO2 = 1.3 × 10−7 Torr), showing that HSO3− at m/z 81 is formed from a consecutive reaction. The signal denoted with * at m/z 83 corresponds to H34SO3−.