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" Adapted from Schwartz (1984a), and Shi and Seinfeld (1991). h a = particle radius, Dg = gas-phase diffusion coefficient, D[ = liquid-phase diffusion coefficient, H = Henry's law constant, a = mass accommodation coefficient, um = mean thermal speed, and k = first-order aqueous-phase rate constant. ' For semi-infinite phase geometry.

" Adapted from Schwartz (1984a), and Shi and Seinfeld (1991). h a = particle radius, Dg = gas-phase diffusion coefficient, D[ = liquid-phase diffusion coefficient, H = Henry's law constant, a = mass accommodation coefficient, um = mean thermal speed, and k = first-order aqueous-phase rate constant. ' For semi-infinite phase geometry.

the rate constant represented by the dashed line is already close to the diffusion-controlled limit. In addition, the plot is not linear as expected from Eq. (PPP), particularly at higher concentrations of bromide.

Hu et al. (1995) interpret this as evidence for an additional reaction channel corresponding to a rapid reaction at the interface itself. Several different approaches have been taken to introduce this additional reaction dimension into the resistance model. For example, Hu et al. (1995) add another resistance term to Fig. 5.16, l/rintcrfatc, shown by the dashed lines in that figure. Their data suggest that 1 /rinterfate is of the form [f + k"ax]/(k"axpj, where k" is a measure of the

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