Spatial Taming and Trapping of Molecules

分子的空间驯化和捕获

• 批准号: 9529386
• 负责人: Dudley Herschbach
• 金额: $ 60.7万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-03-15 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9529386&HistoricalAwards=false
• 关键词: Spatial; Taming; Trapping; Molecules

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Dudley Herschbach of Harvard University will continue his studies using molecular beam techniques to examine the effect on reactive collisional and spectroscopic processes of the alignment of molecules in static electric or magnetic fields. The current project proposes to develop a more general method of spatially trapping molecules than investigated previously which uses an intense laser field to confine suitable molecules for times on the order of hours. In addition to constructing the trapping apparatus, the PI will use directional molecules to study phenomena such as rotationally inelastic collisions of oriented molecules, vector correlations in atom-diatom reactions, and the shift of chemical equilibrium induced by molecular alignment in a strong magnetic field. Normally, when molecules react chemically, the mutual orientation of the colliding partners is completely random. Prof. Herschbach is developing a general method for orienting the molecules prior to reaction in order to see if there is an effect on the outcome. Using this technique, chemical reaction mechanisms can be elucidated at an unprecedented level of detail. The use of oriented molecular targets in molecular beam studies of chemical reactions will lead to much more accurate and detailed pictures of gas phase reaction mechanisms.

在化学学部实验物理化学项目中，哈佛大学的Dudley Herschbach将继续使用分子束技术研究静电或磁场下分子排列对反应性碰撞和光谱过程的影响。目前的项目建议开发一种比以前研究的更通用的空间捕获分子的方法，即使用强激光场将合适的分子限制在几个小时的时间内。除了构建捕获装置外，PI还将使用定向分子来研究定向分子的旋转非弹性碰撞、原子-硅藻反应中的矢量相关性以及强磁场中分子排列引起的化学平衡转移等现象。通常，当分子发生化学反应时，相互碰撞的伙伴的方向是完全随机的。Herschbach教授正在开发一种用于在反应前确定分子方向的通用方法，以便观察是否对结果有影响。利用这种技术，化学反应机制可以在一个前所未有的细节水平上得到阐明。在化学反应的分子束研究中使用定向分子靶标将导致气相反应机制更精确和详细的图像。