Particle Formation from Photooxidation of αpinene, Limonene, and Myrcene
Particle Formation from Photooxidation of αpinene, Limonene, and Myrcene
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α蒎烯、柠檬烯和月桂烯的光氧化形成颗粒
DOI：
10.1021/acs.jpca.1c08427
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Wentzel, Michael
中科院分区：
文献类型：
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作者：
Hanson, David R.;Sawyer, Adam;Long, Darlene;Sofio, Dominick;Kunz, Joan;Wentzel, Michael
我们目前的测量的第一代二次有机气溶胶（SOA）材料的生长的1000纳米直径的种子颗粒组成的硫酸和水的影响。实验是在一个大气压，垂直排列的流动反应器中进行的，在SO2或单萜的存在下，从HONO光解产生OH。在典型条件下，在约6 × 106 cm-3的[OH]下，将浓度为300 ppbv的有机化合物暴露于光氧化反应中约80 s：因此，氧化产物具有最小的OH暴露。然后，测量的硫酸晶种颗粒的尺寸变化可以归因于第一代产物的吸收。沿着对装置和过程的描述，详细分析了通过将SOA产率与用H2SO 4（g）生长进行比较来获得SOA产率。α-蒎烯、柠檬烯和月桂烯的光氧化实验结果分别给出SOA产率为0.040、0.084和0.16。每向化合物中添加一个双键，这些SOA的产率大致翻一番。α-蒎烯和柠檬烯的SOA产率与前人的SOA实验结果雅阁，而月桂烯的SOA产率与前人的SOA实验结果完全一致。月桂烯的光氧化也导致显着的成核，和负责的物种是可比的H2SO 4在35%的相对湿度在其成核能力。
We present measurements of the effect of first-generation secondary organic aerosol (SOA) material on the growth of ∼10 nanometer diameter seed particles composed of sulfuric acid and water. Experiments were performed in an atmospheric pressure, vertically aligned flow reactor where OH was produced from HONO photolysis in the presence of either SO2or a monoterpene. For typical conditions, organic compounds at ∼300 ppbv are exposed to photooxidation for a time of ∼80 s at a [OH] of about 6 × 106cm–3: thus, oxidation products have minimal OH exposure. The measured size changes of the sulfuric acid seed particles can then be attributed to the uptake of first-generation products. Along with descriptions of the apparatus and the procedure, the analysis to obtain SOA yields by comparing them to growth with H2SO4(g) is detailed. Results from photooxidation experiments of αpinene, limonene, and myrcene give SOA yields of 0.040, 0.084, and 0.16, respectively. These SOA yields roughly double with each addition of a double bond to the compound. The αpinene and limonene results are in accord with the results of many previous SOA experiments, while the myrcene SOA yield stands alone. Photooxidation of myrcene also led to significant nucleation, and the species responsible is comparable to H2SO4at a 35% relative humidity in its nucleation capability.