Fig. 6: Determination of upper limits to oxyacid-formation rate constants. | Nature Communications

Fig. 6: Determination of upper limits to oxyacid-formation rate constants.

From: A gas-to-particle conversion mechanism helps to explain atmospheric particle formation through clustering of iodine oxides

Fig. 6

Time-of-flight mass spectra (ToF-MS) obtained with photoionization energies (PIE) of 10.5 eV (panels a–d) and 11.6 eV (panels e–h) in broadband photolysis (BBP) experiments at 450 Torr and 30 Torr, respectively, without added water (blue line) and with 2% water mixing ratio (black line). Note that the labels of y and x axes are the same for all panels in the same column. The vertical black lines indicate the position of the oxide and oxyacids in the m/z axis: from left to right: IO, HOI, OIO, HOIO, HOIO2. Simulated oxyacid ion peaks (thick lines) resulting from four different kinetic modeling scenarios with different rate constants are overlaid to the measured spectra: I + H2O + O3 → HOIO/HOIO2 + HO2/OH (a, b) IOIO + H2O → HOIO2 + HO2 (b, f), I2O3 + H2O → HOI + HOIO2 (c, g), I2O4 + H2O → HOIO + HOIO2 (d, h), and I + H2O + O3 → OH + HOIO2. Note that reactions producing HOx also would result in the generation of HOI (panels a, e).

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