The Surface Spectroscopy of a Single Aerosol Particle

单个气溶胶颗粒的表面光谱

• 批准号: 8905871
• 负责人: Stephen Arnold
• 金额: --
• 依托单位: Polytechnic University of New York
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-09-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8905871&HistoricalAwards=false
• 关键词: Surface; Spectroscopy; Single; Aerosol; Particle

This research will extend work on the spectroscopy of single levitated aerosol particles into the surface region with the development of three new spectroscopies. The first, surface tension spectroscopy, to provide a measure of the surface molecular excess; the second, electromagnetic sounding (using fluorescence and second harmonic generation), to provide microscopic information on molecular orientation at the surface and the distribution of molecules in the interior; and the third, phase boundary phase shift spectroscopy, to provide an on-line measure of the water condensation rate at the surface. This will be the first application of all three spectroscopies to investigate microscopic effects associated with water condensation in the presence of surface active species of atmospheric interest. Preparation of surface coatings having specific densities will be facilitated by the use of a proposed microparticle collider. This research will provide new techniques for the study of atmospheric aerosol physical and chemical property.

这项研究将通过开发三种新光谱将单个悬浮气溶胶颗粒的光谱工作扩展到表面区域。第一，表面张力光谱，以提供一个测量的表面分子过剩;第二，电磁测深（使用荧光和二次谐波产生），以提供微观信息的分子取向在表面和分子的分布在内部;和第三，相边界相移光谱，以提供一个在线测量的水冷凝率在表面。这将是所有三种光谱的第一次应用，以调查与大气中存在的表面活性物质的水冷凝相关的微观效应。具有特定密度的表面涂层的制备将通过使用所提出的微粒碰撞器来促进。该研究将为大气气溶胶物理化学性质的研究提供新的技术手段。