Magnetic Resonance: Metal Hydrides and Innovative Techniques

这个实验研究项目以核磁共振技术为基础，有两个主要推动力：(1)金属氢化物研究和(2)核磁共振技术创新的发展。关于氢化物(1)的工作集中在一个案例中，在60-80K附近的温度范围内，氢或氢在元素HCP稀氢化合物中的运动。在第二个方面，将检查YH2-YH3系统，该系统可能用作可切换反射镜。(2)自旋回波双共振(SEDOR)将被扩展为一种核磁共振技术，其回波幅度A将被测量为未观测到的自旋上的翻转角的函数。这一新方法将应用于非晶态氢化硅。核Overhauser效应(NOE)将被用来加强光学技术的使用，这些技术以前已经由其他人开发来提供20%-50%的氦3或Xe 129的核自旋极化。原子核的Overhaser效应将被用来将这种极化的一部分转移到具有分析重要性的自旋上，例如质子和C13。NOE将在一种拟议的技术中进行额外的应用，以避免在溶剂中稀溶溶质共振的核磁共振研究中的不均匀展宽。这个实验研究项目是基于核磁共振技术。在这项工作的一个方面，将研究金属氢化物中的氢或重离子共振，以澄清氢或重离子在氢化物结构中的运动状态。金属氢化物作为储能介质具有潜在的应用价值。在这项工作的第二个方面，该项目将研究核磁共振技术的增强，并结合单独开发的核自旋极化技术。新方法将利用核欧瓦用户效应，并可能允许核磁共振在分析研究中的新应用。其次，在需要稀溶物的溶液中，新方法将极大地减少由于与溶剂分子相互作用而引起的展宽。这项研究项目本质上是跨学科的，涉及将接受良好培训以进入工业、政府或教育职位的本科生和研究生。***

w:\awards\awards96\num.doc 9705080 Conradi This experimental research project is based on NMR techniques, and has two main thrusts: (1) study of metal hydrides and (2) development of innovation in NMR technique. The work on hydrides (1) focuses in one case on motion of hydrogen or deuterium in elemental hcp dilute hydrides, in the temperature range near 60- 80K. In a second aspect, the YH2-YH3 system, with possible application as a switchable mirror, will be examined. (2) Spin- echo double resonance (SEDOR) will be extended as an NMR technique in such a way that the echo amplitude A will be measured as a function of the flip angle on the unobserved spins.This new method will be applied to amorphous hydrogenated silicon. The nuclear Overhauser effect (NOE) will be exploited to enhance the use of optical techniques, which have previously been developed by others to provide 20-50% nuclear spin polarization of helium 3 or Xe 129. The nuclear Overhauser effect will be used to transfer some of this polarization to spins of analytical importance, such as protons and C13. An additional application of the NOE will be made in a proposed technique to avoid inhomogeneous broadening in NMR study of dilute solute resonances in a solvent. %%% This experimental research project is based on the technique of nuclear magnetic resonance. In one aspect of the work, the hydrogen or deuterium resonance in metal hydrides will be studied to clarify the state of motion of hydrogen or deuterium ions in the hydride structure. Metal hydrides are of interest for potential use as an energy storage medium. In a second aspect of the work, the project will research an enhancement of the nuclear magnetic resonance technique, in conjunction with a separately developed nuclear spin polarization technique. The new method will make use of the nuclear Overha user effect, and may permit new applications of nuclear magnetic resonance in analytical studies. Secondly, in solutions, where a dilute solute is of interest, the new method will greatly reduce the broadening which arises from interaction with the solvent molecules. This research project is interdisciplinary in nature and involves graduate and postgraduate students who will be excellently trained to enter positions in industry, government or education. ***