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. 2020 Sep 9;11:4521. doi: 10.1038/s41467-020-18252-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — The experiment was started by 248-nm pulsed laser photolysis (PLP) of O₃ in the presence of I₂ at 10 Torr with 2% water mixing ratio (6.5 × 10¹⁵ molecule cm⁻³). The average signal level before PLP has been subtracted. Clear lines indicate time evolution of high signals at certain m/z values (color-coded time-of-flight mass spectrometry (ToF-MS) signal in arbitrary units). Formation of IO (m/z = 143), HOI (144) and OIO (159) is followed by the appearance of I₂O_y, I₃O_y, and larger clusters with the odd number of iodine atoms. At late times all traces grow similarly as a result of photofragmentation of large I_xO_y. The time-resolved mass spectra obtained for humid conditions are almost identical to those obtained under dry conditions, except for the presence of HOI and a slight decrease of all I_xO_y signals. In this experiment, HOIO₂ would not be expected to be observed due to the photoionization energy (PIE) of 10.5 eV below the ionization threshold.