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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Interaction of OH radicals with Arizona Test Dust: Uptake and products
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Interaction of OH radicals with Arizona Test Dust: Uptake and products

机译：OH自由基与Arizona Test Dust的相互作用：吸收和产物

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摘要

Kinetics and products of the interaction of OH radicals with solid films of Arizona Test Dust (ATD) were studied using a low pressure flow reactor (0.5-3 Torr) combined with a modulated molecular beam mass spectrometer for monitoring of the gaseous species involved. The reactive uptake coefficient of OH was measured from the kinetics of OH consumption on Pyrex rods coated with ATD as a function of OH concentration ((0.4-5.2) × 10~(12) molecules cm~(-3)), relative humidity (RH = 0.03-25.9%), temperature (T = 275-320 K), and UV irradiance intensity (JNO2 = 0-0.012 s~(-1)). Deactivation of ATD surface upon exposure to OH was observed. The initial uptake coefficient was found to be independent of temperature and irradiation conditions and to decrease with relative humidity: γ_0 = 0.2/(1 + RH~(0.36)) (calculated using geometric surface area, with 30% estimated conservative uncertainty). H_2O_2 and H _2O were observed in the gas phase as products of the OH reaction with ATD surface with yields of (10 ± 3) and (98 ± 25) %, respectively.
机译：使用低压流动反应器（0.5-3托）结合调制分子束质谱仪研究了所涉及的气态物种，研究了OH自由基与Arizona Test Dust（ATD）固体薄膜相互作用的动力学和产物。 OH的反应性吸收系数由涂有ATD的Pyrex棒上的OH消耗动力学随OH浓度（（0.4-5.2）×10〜（12）分子cm〜（-3）），相对湿度（ RH = 0.03-25.9％），温度（T = 275-320 K）和UV辐照强度（JNO2 = 0-0.012 s〜（-1））。观察到暴露于OH时ATD表面失活。发现初始吸收系数与温度和辐照条件无关，并随相对湿度而降低：γ_0= 0.2 /（1 + RH〜（0.36））（使用几何表面积计算，估计有30％的保守不确定性）。在气相中观察到H_2O_2和H_2O是具有ATD表面的OH反应的产物，产率分别为（10±3）％和（98±25）％。

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