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Optical Emissions from Photoexcitation of Atmospheric Radicals and Molecules in the Gas Phase and on Aerosol Surfaces

气相和气溶胶表面上的大气自由基和分子的光激发光发射

基本信息

批准号：
9016731
负责人：
Long Lee
金额：
$ 10万
依托单位：
San Diego State University Foundation
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1991
资助国家：
美国
起止时间：
1991-04-01 至 1993-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016731&HistoricalAwards=false
关键词：
Optical Emissions Photoexcitation Atmospheric Radicals

项目摘要

The project is devoted primarily to atmospheric aerosols. Laboratory experiments will probe the conditions under which aerosols of ammonium sulfate and ammonium bisulfate can be formed in the gas phase from ammonia, sulfur trioxide and water vapor. The aerosols will be produced by mixing the reacting gases in a flow tube. Particle-size distributions of the resulting aerosols will be deduced from measurements of ultraviolet light scattering. Experiments will assess the possibility of chemically identifying such aerosols by observing light emitted by them when they are exposed to laser beams of variable wavelength and intensity. Variations of these experiments will test possibilities of separately detecting chemical species adhering to the surfaces of the aerosol particles. Similar experiments will be conducted on the formation of ammonium nitrate aerosols from ammonia, water vapor, nitric acid and/or nitrogen dioxide. The experiments will be useful for better understanding of conditions under which these aerosols are formed in both the natural and the perturbed atmosphere. The feasibility of measuring the aerosols under field conditions will be explored. Experiments aimed at detecting chemical species adhering to the aerosol surfaces are designed to reveal any unsuspected surface- chemical properties of the aerosols, by virtue of which they might influence the chemistry of the gas phase.

该项目主要致力于大气气溶胶。实验室实验将探索在何种条件下，可以形成硫酸铵和硫酸氢铵的气溶胶在气相中从氨、三氧化硫和水蒸气中分离。气溶胶将通过将反应气体混合在流量管产生的气溶胶的粒度分布将从紫外线的测量中推断出来散射实验将评估化学反应的可能性通过观察它们发出的光来识别这种气溶胶，它们暴露于可变波长的激光束，强度。这些实验的变化将测试分别检测粘附的化学物质的可能性气溶胶颗粒的表面。类似的实验将在形成氨、水蒸气、硝酸产生的硝酸铵气溶胶和/或二氧化氮。这些实验将有助于更好地理解这些气溶胶形成的条件，自然的和混乱的气氛。的可行性将探讨在实地条件下测量气溶胶的方法。实验旨在检测粘附在气溶胶表面被设计成暴露任何未被怀疑的表面- 气溶胶的化学性质，凭借这些性质，可能会影响气相的化学性质