Extended Data Fig. 3: Detection of iodine oxide radicals and IxOy species, including the key species IOIO, IOIO4, HOI, and HIO3.
From: The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source
Concentrations of iodine species as measured by the \({{{{\rm{NO}}}}}_{3}^{-}\)-CIMS and the Br−-MION-CIMS, and as modelled by the base-case and extended model. The bottom panel shows the loss rate of sticky molecules to the chamber walls, to particle surfaces, and to dilution. The grey shaded period shows an experiment with extremely high IOx concentrations, where IOIO4 is clearly detected, but extreme particle concentrations and chamber inhomogeneities lead to higher model-measurement differences. The base-case model does not form any HOI or HIO3 in UV-dark conditions. The extended model reproduces both and improves the closure also for other molecules. Calibration factors are given in Supplementary Table 3. T = 263 K.
