Molecular Dissociation Dynamics on Selected Regions of Excited Electronic Potential Energy Surfaces

受激电子势能面选定区域的分子解离动力学

• 批准号: 9007769
• 负责人: Laurie Butler
• 金额: $ 28.71万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9007769&HistoricalAwards=false
• 关键词: Molecular; Dissociation; Dynamics; Selected; Regions

Dr. Laurie J. Butler is supported by a grant from the Experimental Physical Chemistry Program to study the time evolution of molecular dissociation processes from electronically excited molecules. These measurements will allow for an enhanced detailed understanding of how molecules decompose and form various sub-molecular moieties or of how chemical species react with other systems. The initial experiments use polarized emission spectroscopy, which measures the wavelength and polarization of the photons emitted during dissociation, to probe the change in the nuclear dynamics induced by forces at a conical intersecton along the dissociative pathway. Professor Butler focuses on determining the change in the dissociation dynamics and the branching between energetically allowed fragmentation products induced by 1) the presence of a conical intersection along the dissociation pathway, 2) the excitation of a selected vibrationally activated molecule to the electronically dissociative state, allowing access to the excited potential surface beyond the Franck-Condon region, and 3) the change in the nonadiabatic coupling between two dissociative electronic states when a vibrationally excited molecule is promoted to the dissociative surface.

Laurie J. Butler博士获得了实验物理化学计划的资助，研究电子激发分子的分子解离过程的时间演变。这些测量将允许对分子如何分解和形成各种亚分子部分或化学物质如何与其他系统反应有更详细的了解。最初的实验使用偏振发射光谱，测量离解过程中发射的光子的波长和偏振，以探测由离解路径上的锥形交叉点的力引起的核动力学变化。巴特勒教授专注于确定解离动力学的变化和能量允许的分裂产物之间的分支：1)解离路径上的圆锥形交叉的存在，2)选定的振动激活分子激发到电子解离状态，允许进入frank - condon区域以外的激发电位表面，以及3)当振动激发分子被提升到解离表面时，两个解离电子态之间非绝热耦合的变化。