Table 1.

Constants for reactive uptake of isoprene SOA precursors^a

Speciesb	H* [M atm−1]	kH+ [M−1 s−1]	knuc [M−2 s−1]	kHSO4- [M−1 s−1]	kaq [s−1]
IEPOX	3.3 × 107, c	3.6 × 10−2, d	2.0 × 10−4, e	2.0 × 10−4, e	Equation (2)
ISOPNβf	3.3 × 105, g	-	-	-	1.6 × 10−5, h
ISOPNδf	3.3 × 105, g	-	-	-	6.8 × 10−3, h
DHDN	3.3 × 105, g	-	-	-	6.8 × 10−3, i

^aEffective Henry’s law constants H* and aqueous-phase rate constants used to calculate reactive uptake coefficients γ for isoprene SOA precursors IEPOX, ISOPN_β, ISOPN_δ, and DHDN following Eqs. (1) and (2). Calculation of γ for other isoprene SOA precursors in Fig. 2 is described in the text.

^bSee Fig. 2 for definition of acronyms.

^cBest fit to SOAS and SEAC⁴RS IEPOX SOA and consistent with Nguyen et al. (2014).

^dCole-Filipiak et al. (2010).

^eEddingsaas et al. (2010).

^fISOPN species formed from the beta and delta isoprene oxidation channels (Paulot et al., 2009a) are treated separately in GEOS-Chem.

^gBy analogy with 4-nitrooxy-3-methyl-2-butanol (Rollins et al., 2009).

^hJacobs et al. (2014).

ⁱAssumed same as for ISOPN_δ (Hu et al., 2011).