Journal
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
Volume 224, Issue 7-8, Pages 1095-1117Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1524/zpch.2010.6143
Keywords
Iodine Oxides; Nucleation; Humidity; Acid Uptake; Temperature
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Funding
- UK Natural Environment Research Council (NERC) [NE/E005659/1]
- Indian Government
- School of Chemistry
- NERC [NE/D009308/1]
- NERC [NE/E005659/1] Funding Source: UKRI
- Natural Environment Research Council [NE/E005659/1, NE/D009308/1] Funding Source: researchfish
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The formation and growth of iodine oxide particles (IOPs) originating from molecular iodine precursor has been studied at room temperature as a function of water vapour and sulphuric and oxalic acid vapours A linear variation in total IOP mass was observed over a wide range of iodine atom production rates under both dry and humid formation conditions Particle formation was also observed in the absence of ozone and was found to be temperature sensitive with elevated temperatures resulting in reduced particle number and mass Electronic structure calculations are used to show that particle formation is initiated by polymerization of I2O4 with I2O3 or with itself Formation of IOPs in humid conditions results in lower numbers and smaller particles than formed in the absence of water vapour because H2O forms relatively stable complexes with molecules such as I2O3 and I2O4 inhibiting their polymerization Addition of H2O to particles formed under dry conditions shows the collapse of fractal like aggregate particle structures The uptake of sulphuric acid vapour onto humidified particles was studied over a wide range of relative humidity (RH) at room temperature with the calculated accommodation coefficient (alpha) for this process increasing with RH to a value of 0 75 +/- 0 05 at RH = 90% In contrast growth of particles exposed to oxalic acid vapour was not observed on the expert mental timescales employed indicating an upper limit for alpha of 10(-3)
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