Functionalized Secondary Organic Particle Phase Products from Terpenes and Terpene Oxidation Products (FuProTer II)

有机物质经常构成大陆地区最大的气溶胶成分。由于颗粒有机化合物对热力学、微物理和化学性质的巨大影响，需要对有机化合物对气溶胶形成和改性的影响进行定量描述。在这个项目中，萜烯和萜烯氧化产物的反应将在一个气溶胶室进行研究。主要关注的是在已有的具有不同酸度的颗粒上形成功能化颗粒有机产物。首先，将研究选定的萜烯（α-蒎烯、β-蒎烯和柠檬烯）与oh自由基的反应，以更深入地了解颗粒有机物的形成机制。在这里，特别是在我们之前的dfg项目中发现的作为臭氧分解萜烯的产物的低聚颗粒产物和硫酸盐酯形成的条件和反应途径应该加以阐明，以估计这些化合物与真实大气的相关性。其次，将研究已知的半挥发性萜烯氧化产物（蒎醛、壬皮酮、安多林）与oh自由基的反应，以提高我们对大气中萜烯氧化机制的进一步了解。还将研究反应条件（r.h.，初始浓度）对颗粒产物和产量的影响。

Organic matter frequently makes up the largest aerosol fraction over continental regions. Because of the large influence of particulate organic compounds on thermodynamic, microphysical and chemical properties a quantitative description of the impact of organic compounds to aerosol formation and modification is needed. Within this project the reaction of terpenes and terpene oxidation products will be studied in an aerosol chamber. Main focus is the formation of functionalized particulate organic products on pre-existing particles with different acidities. First, the reactions of selected terpenes (α-pinene, β-pinene and limonene) with OH-radicals will be studied to get a deeper insight into the mechanisms of particulate organic matter formation. Here especially the conditions and reaction pathways for the formation of oligomeric particulate products and of sulfate esters which have been found as products of the ozonolysis of terpenes in our preceding DFG-project should be elucidated to get an estimate of the relevance of these compounds to the real atmosphere. Secondly, the reaction of known semivolatile terpene oxidation products (pinonaldehyde, nopinon, endolim) with OH-radicals will be investigated to improve our understanding of the further steps in atmospheric terpene oxidation mechanisms. The influence of reaction conditions (R.H., initial concentrations) on particulate products and yields will also be studied.