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Uptake of HO<sub>2</sub> radicals on Arizona test dust surface

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Fig. 1. Diagram of the flow photoreactor.
Fig. 2. Typical uptake profile of HO 2 on ATD surface: T = 300 K, P = 1 Torr, dry conditions (RH ≈ 0.02 %), [HO 2 ] 0 = 1.3 × 10 12 molecule cm −3 , sample mass = 0.47 mg cm −1 .
Fig. 3. Example of kinetics of HO 2 consumption in reaction with ATD surface: T = 300 K, P = 1 Torr, dry conditions, [HO 2 ] 0 = 2.0 × 10 12 molecule cm − 3
Fig. 4. Dependence of the uptake coe ffi cients of HO 2 (calculated using geometric surface area) on mass of ATD samples (per 1 cm length of the support tube): T = 300 K, P = 1 Torr, dry  con-ditions, [HO 2 ] 0 ≈ 10 12 molecule cm −3
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