CAREER: Understanding Molecular-level Processes of Gas-phase Ammonia Uptake by Aqueous Sulfuric Acid Surfaces using Broadband Sum Frequency Generation Spectroscopy

职业：使用宽带和频发生光谱了解硫酸水溶液表面吸收气相氨的分子水平过程

• 批准号: 0134131
• 负责人: Heather Allen
• 金额: $ 48.5万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-01 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0134131&HistoricalAwards=false
• 关键词: CAREER; Understanding; Molecular; level; Processes

Professor Heather Allen of Ohio State University has received a CAREER award from the Analytical and Surface Chemistry Program for sum frequency generation studies on gas-liquid surfaces, especially ones of environmental interest. Ammonia uptake by aqueous sulfuric acid solution surfaces will be investigated using broad-band SFG, allowing the acquisition of vibrational spectra specific to the surface region. The spectra will be interpreted to give molecular level pictures of the surface uptake mechanisms of the reactive gas by the liquid. The ammonia-sulfuric acid system has relevance to the formation and growth of ammonium sulfate aerosols throughout the troposphere and is particularly important in polluted urban atmospheres. The PI will incorporate problem-based-learning in undergraduate courses, and will sponsor a program that will award summer research internships with the goal of increasing the participation of women and underrepresented minorities in scientific research.Work on the chemical and physical properties of aerosols will lead to a better understanding of their role in atmospheric chemical cycles and in climate. Previous droplet-train experiments showed evidence for surface-mediated reactions, and new laser-based spectroscopies allow the examination of those reactions in a direct manner. Students involved in this research and education plan will be exposed to work that will lead to a better understanding of pollution, as well as the role of basic research in solving complex chemical problems relevant to society.

俄亥俄州立大学的希瑟·艾伦教授获得了分析和表面化学计划颁发的职业奖，以表彰他对气液表面，特别是对环境有兴趣的表面进行的和频率产生研究。将使用宽带SFG研究硫酸溶液表面对氨的吸收，从而获得特定于表面区域的振动光谱。这些光谱将被解释为给出液体对反应气体的表面吸收机制的分子水平图像。氨-硫酸体系与整个对流层硫酸铵气溶胶的形成和增长有关，在受污染的城市大气中尤为重要。PI将把以问题为基础的学习纳入本科课程，并将赞助一个项目，授予夏季研究实习机会，目的是增加女性和未被充分代表的少数群体参与科学研究。研究气溶胶的化学和物理性质将有助于更好地了解它们在大气化学循环和气候中的作用。以前的液滴系列实验显示了表面介导的反应的证据，而新的基于激光的光谱仪允许以直接的方式检查这些反应。参与这项研究和教育计划的学生将接触到有助于更好地了解污染以及基础研究在解决与社会相关的复杂化学问题中的作用的工作。