The Shape of Intermolecular Forces from Spin Relaxation Times

这项研究在实验物理化学计划的支持下，利用核磁共振技术，通过测量稀薄混合气体中的核自旋弛豫时间，获得关于分子之间角度相关相互作用的实验信息。这些测量将直接提供转动角动量传递的截面。要研究的分子是大气、星际介质、火焰系统和红外激光的重要组成部分。除了气相研究外，还将研究化学位移的变化和由于与顺磁物种的碰撞而产生的驰豫时间。铂原子和固体载体上的顺磁过渡金属络合物将提供顺磁中心。还将尝试对沸石和其他类型的分子筛上的可移动物种进行核磁共振研究。

This research, supported by the Experimental Physical Chemistry program, uses nuclear magnetic resonance techniques to obtain experimental information on the angle-dependent interaction between molecules by making measurements of nuclear spin relaxation times in dilute mixtures of gases. These measurements will provide directly the cross sections for transfer of rotational angular momentum. The molecules to be studied are important constituents in the atmosphere, the interstellar medium, flame systems and infrared lasers. In addition to the gas phase studies, changes in chemical shifts and the relaxation times due to collisions with paramagnetic species will be studied. Platinum atoms and paramagnetic transition metal complexes on solid supports will provide the paramagnetic centers. Nuclear magnetic resonance studies of mobile species on zeolites and other classes of molecular sieves will also be attempted.