Revised kinetics in the droplet-train apparatus due to a wall loss

An equation for analyzing the kinetic results for the droplet-train apparatus with a wall loss is derived. We show that the presence of a radial concentration gradient due to loss on the flow reactor wall significantly affects the measured uptake coefficient γ_meas on droplets in the center of the reactor. For an efficient wall loss, γ_meas can be ∼60% less than that calculated without consideration of the loss on the wall. This revision of the kinetics for species with a wall loss leads to an increase in the uncertainty of the extracted gas-surface reaction probability for high water vapor pressure experimental conditions.