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. We present measurements utilizing the Filter Inlet for Gases and Aerosols(FIGAERO) applied to chamber measurements of isoprene-derived epoxydiol(IEPOX) reactive uptake to aqueous acidic particles and associated secondary organic aerosol (SOA)formation. Similar to recent field observations with the same instrument, wedetect two molecular components desorbing from the IEPOX SOA in highabundance: C5H12O4 and C5H10O3 . The thermaldesorption signal of the former, presumably 2-methyltetrols, exhibits twodistinct maxima, suggesting it arises from at least two different SOAcomponents with significantly different effective volatilities. Isothermalevaporation experiments illustrate that the most abundant component givingrise to C5H12O4 is semi-volatile, undergoing nearly completeevaporation within 1 h while the second, less volatile componentremains unperturbed and even increases in abundance. We thus confirm, usingcontrolled laboratory studies, recent analyses of ambient SOA measurementsshowing that IEPOX SOA is of very low volatility and commonly measured IEPOXSOA tracers such as C5H12O4 and C5H10O3 ,presumably 2-methyltetrols and C5 -alkene triols or 3-MeTHF-3,4-diols,result predominantly from thermal decomposition in the FIGAERO-CIMS. Weinfer that other measurement techniques using thermal desorption orprolonged heating for analysis of SOA components may also lead to reported2-methyltetrols and C5 -alkene triols or 3-MeTHF-3,4-diol structures.We further show that IEPOX SOA volatility continues to evolve via acidity-enhanced accretion chemistry on the timescale of hours, potentiallyinvolving both 2-methyltetrols and organosulfates.

Chamber-based insights into the factors controlling epoxydiol (IEPOX) secondary organic aerosol (SOA) yield, composition, and volatility