Magnetic Resonance: Metal Hydrides and Innovative Techniques

本实验研究项目以核磁共振技术为基础，主要有两个重点：(1)金属氢化物的研究；(2)核磁共振技术的创新发展。对氢化物(1)的研究主要集中在氢或氘在60- 80K温度范围内的单质hcp稀氢化物中的运动。在第二个方面，将研究YH2-YH3系统作为可切换镜像的可能应用。(2)将自旋-回波双共振（SEDOR）扩展为一种核磁共振技术，以这种方式测量回波振幅a作为未观察到的自旋翻转角的函数。该方法将应用于非晶氢化硅的制备。利用核超豪瑟效应（NOE）将增强光学技术的使用，光学技术先前已由其他人开发，可提供氦3或Xe 129的20-50%核自旋极化。核Overhauser效应将用于将这种极化的一部分转移到具有分析意义的自旋上，例如质子和C13。NOE的另一个应用将在一项提议的技术中进行，以避免溶剂中稀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以核磁共振技术为基础的。在工作的一个方面，将研究氢或氘在金属氢化物中的共振，以澄清氢或氘离子在氢化物结构中的运动状态。金属氢化物作为一种能量储存介质的潜在用途引起了人们的兴趣。在工作的第二个方面，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Overha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，在对稀溶质感兴趣的溶液中，新方法将大大减少由于与溶剂分子相互作用而产生的展宽。该研究项目是跨学科性质的，涉及研究生和研究生，他们将接受良好的培训，进入工业，政府或教育岗位。*＊*

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. ***