The Analysis, Reactions and Growth of Aerosol Particles Studied by Vacuum UV Photoionization Mass Spectrometry

真空紫外光电离质谱法研究气溶胶颗粒的分析、反应和生长

• 批准号: 0509837
• 负责人: Tomas Baer
• 金额: --
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0509837&HistoricalAwards=false
• 关键词: Analysis; Reactions; Growth; Aerosol; Particles

Tomas Baer of the University of North Carolina at Chapel Hill is supported by The Experimental Physical Chemistry Program and the Atmospheric Chemistry Program to employ vacuum ultraviolet (VUV) light to investigate complex mixtures of organic constituents in aerosols generated in laboratory flow tubes, reaction chambers, and in an outdoor smog chamber. VUV light in the form of synchrotron radiation, pulsed laser-generated radiation, and rare gas resonance lamps will be utilized to study both large and small particles. The reactivity of model aerosols will be examined as a function of their morphology. The reaction rates of coated particles as well as particles consisting of organics embedded in porous particles with ozone will be measured in the laboratory. A major emphasis will be on identification of organic constituents in secondary organic aerosols and species generated by gas-particle reactions. A rare gas resonance lamp will be installed to investigate its use for detecting small particles in smog chamber studies that do not lend themselves to pulsed laser ionization. As well, experiments at the Advanced Light Source will be directed at controlled nucleation studies in a laboratory reaction chamber. Many naturally occurring small particles in the environment are highly heterogeneous, containing mixtures of carbon, salts, metals, and organic molecules. When these particles are in contact with certain gases, the chemical reactions that occur will be affected by the particle properties. New experimental methods to study aerosol particles will be developed in this project. In addition, the new methods will be used to examine aerosol formation in controlled atmospheres that mimic real-world environmental systems. This research will be carried out by students and postdoctoral associates, who will be broadly trained in physical, analytical, and environmental chemistry.

位于查佩尔山的北卡罗来纳州大学的Tomas Baer在实验物理化学计划和大气化学计划的支持下，采用真空紫外（VUV）光来研究实验室流管、反应室和室外烟雾室中产生的气溶胶中有机成分的复杂混合物。 同步辐射、脉冲激光产生的辐射和稀有气体共振灯形式的真空紫外光将用于研究大颗粒和小颗粒。模型气溶胶的反应性将作为其形态的函数进行检查。 在实验室中，将测量包覆颗粒以及由嵌入多孔颗粒中的有机物组成的颗粒与臭氧的反应速率。 主要重点将是查明二次有机气溶胶中的有机成分和气体-颗粒反应产生的物种。 将安装一个稀有气体共振灯，以研究其用于检测烟雾室研究中的小颗粒，这些烟雾室研究不适合脉冲激光电离。 此外，先进光源的实验将在实验室反应室中进行受控成核研究。 环境中许多天然存在的小颗粒是高度异质的，含有碳、盐、金属和有机分子的混合物。 当这些颗粒与某些气体接触时，发生的化学反应会受到颗粒性质的影响。 本项目将开发研究气溶胶粒子的新实验方法。 此外，新方法将用于检查模拟真实环境系统的受控大气中的气溶胶形成。 这项研究将由学生和博士后进行，他们将在物理，分析和环境化学方面接受广泛的培训。