Gas-Phase Organic Oxidation Chemistry and Atmospheric Particles
Gas-Phase Organic Oxidation Chemistry and Atmospheric Particles
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气相有机氧化化学和大气颗粒
DOI：
10.1142/9789813271838_0004
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Schervish, Meredith
中科院分区：
文献类型：
--
作者：
Donahue, Neil M.;Chuang, Wayne;Schervish, Meredith
有机气溶胶包含丰富的化合物混合物，许多是通过非选择性自由基氧化产生的。这产生了过多的产品，大多数未被识别，并且随着仪器的使用，对机械的理解得到了改善。最近的进展包括认识到，一些过氧自由基进行内部氢原子转移反应，以产生高度氧化的分子和认识到，气相缔合反应可以形成更高的分子量的产品能够在大气条件下成核。颗粒的范围也从含有几个分子的直径接近1 nm的分子簇到含有10亿或更多分子的1μm以上的粗颗粒。有机物的混合物通常驱动颗粒的生长。我们可以通过详细的热力学来描述这一点，我们也可以描述驱动含有半挥发性有机物的单独种群之间混合的物理学。最后，完全尺寸分辨的粒子微观物理学使理论和实验室实验中的观测结果之间的详细比较成为可能。
Organic aerosols comprise a rich mixture of compounds, many generated via nonselective radical oxidation. This produces a plethora of products, most unidentified, and mechanistic understanding has improved with instrumentation. Recent advances include recognition that some peroxy radicals undergo internal H-atom transfer reactions to produce highly oxygenated molecules and recognition that gas-phase association reactions can form higher molecular weight products capable of nucleation under atmospheric conditions. Particles also range from molecular clusters near 1 nm diameter containing a few molecules to coarse particles above 1μm containing 1 billion or more molecules. A mixture of organics often drives growth of particles. We can describe this via detailed thermodynamics, and we can also describe the physics driving mixing between separate populations containing semi-volatile organics. Finally, fully size-resolved particle microphysics enables detailed comparisons between theory and observations in chamber experiments.