Experimental Probes of Nonadiabatic Dynamics and Novel Reaction Pathways in Polyatomic Molecules

多原子分子非绝热动力学和新反应途径的实验探索

• 批准号: 1111348
• 负责人: Arthur Suits
• 金额: $ 47.48万
• 依托单位: Wayne State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1111348&HistoricalAwards=false
• 关键词: Experimental; Probes; Nonadiabatic; Dynamics; Novel

In this project funded by the Chemical Structure, Dynamics and Mechanisms Program of the Chemistry Division, Professor Suits of Wayne State University will conduct investigations of the dissociation of polyatomic molecules using laser techniques that are sensitive to the electronic and spin angular momentum of the products. The findings can then be used to unravel the detailed dynamics of these dissociation events. A key aspect of the proposed work is development of an approach for efficient detection of electron spin polarization in hydrogen atom photo-fragments, a principal product of the dissociation of a great many polyatomic molecules. A second aspect of the proposed studies is a strategy to control the novel "roaming radical" reaction mechanism identified in formaldehyde and acetaldehyde decomposition. Broader impacts of the proposed work include development of a new high-resolution image acquisition system that will be freely distributed to other groups. In addition, recruitment and training of a diverse group of undergraduate students, graduate students and post-docs in methods in ion imaging, laser spectroscopy and data analysis is a core aspect of the group activity.An important question in the decomposition of photoexcited molecules is the sequence of electronic states that are encountered in the course of dissociation, and the ways in which they influence the final outcome. This question has direct bearing in many diverse areas from solar energy capture to vision to atmospheric chemistry: almost anywhere that molecules interact with light.

在这个由化学系化学结构、动力学和机制计划资助的项目中，韦恩州立大学的Suits教授将使用对产品的电子和自旋角动量敏感的激光技术来研究多原子分子的解离。然后，这些发现可以用来解开这些解离事件的详细动力学。这项工作的一个关键方面是开发一种有效地检测氢原子光碎片中电子自旋极化的方法，氢原子光碎片是大量多原子分子解离的主要产物。拟议研究的第二个方面是控制甲醛和乙醛分解中发现的新的“漫游自由基”反应机理的策略。拟议工作的更广泛影响包括开发一种新的高分辨率图像采集系统，该系统将免费分发给其他群体。此外，招募和培训不同的本科生、研究生和博士后学习离子成像、激光光谱分析和数据分析的方法是小组活动的核心方面。光激发分子分解中的一个重要问题是在解离过程中遇到的电子态的顺序，以及它们影响最终结果的方式。这个问题直接关系到许多不同的领域，从太阳能捕获到视觉再到大气化学：几乎在任何分子与光相互作用的领域。