Total Radical Production and Degradation Products from Alkene Ozonolysis

大气成分是由排放和大气中的化学作用共同决定的。大多数排放到大气中的碳氢化合物的去除是通过与羟基自由基(OH)的反应而开始的。接下来是一系列的降解步骤，最终导致二氧化碳和水的产生。在氮氧化物存在的情况下，碳氢化合物的氧化会导致产生臭氧/一种对人类健康、植物和材料有害的污染物。臭氧形成的程度取决于碳氢化合物氧化步骤的细节。OH是通过阳光作用于臭氧而自然形成的。与碳氢化合物反应后，OH被转化为HO2和RO2、氢基和有机过氧基。如果存在中等水平的NO，则RO2和HO2可以转化回OH/这是自由基循环的一个例子。OH水平控制着污染物和甲烷等全球变暖气体的丰度，并限制臭氧的产生速度。为了量化这些影响，我们需要了解控制OH水平的过程，而为了预测给定碳氢化合物对大气的影响，我们必须确定其降解产物/例如，评估它们是否具有足够长的寿命，可以从其起源点运输。

Atmospheric composition is determined by a combination of emissions and chemical processing within the atmosphere. The removal of most hydrocarbons emitted to the atmosphere is initiated by reaction with the hydroxyl radical (OH). A series of degradation steps follows, leading eventually to CO2 and water. In the presence of nitrogen oxides, hydrocarbon oxidation leads to production of ozone / a pollutant harmful to human health, vegetation and materials. The extent to which ozone formation occurs depends upon details of the hydrocarbon oxidation steps. OH is formed naturally through the action of sunlight upon ozone. Following reaction with hydrocarbons, OH is converted into HO2 and RO2, hydro and organic peroxy radicals. RO2 and HO2 can then be converted back into OH if moderate levels of NO are present / an example of radical cycling. OH levels control the abundance of pollutants and global warming gases such as methane, and limit the rate of ozone production. To quantify these effects, we need to understand the processes which govern OH levels, while to predict the atmospheric impact of a given hydrocarbon, we must identify its degradation products / e.g., to assess if they have a long enough lifetime to be transported from their point of origin.