Presidential Young Investigator: Nuclear Magntic Resonance Studies

这个项目是在一般地区的分析和表面 化学和核磁共振领域 (NMR)谱本研究旨在研究 稀释自旋的组合魔角自旋（MAS）的效用 像碳-13，具有丰富的自旋敏感性， 质子的空间定位方法结合 高功率交叉极化和质子去耦。是 进一步提出使用适当的脉冲序列， 与rf梯度结合，应该允许稀有自旋NMR 给定样品的局部区域的光谱。因此 这项研究的总体目标是获得化学信息 从样品的选定区域内的NMR光谱。 这种方法应该在许多领域得到应用， 化学研究，包括1）有机固体和聚合物，2） 界面反应，3）同位素标记分子 掺杂到多孔材料中，4）层状材料，和 5)存在缺陷、裂纹或其他缺陷的器械。 这五年继续拨款给加州大学 支持沙卡教授担任总统 青年调查员旨在促进他的快速和 作为一个独立的研究人员在该领域的有效增长 固态NMR光谱学。

This project is in the general area of analytical and surface chemistry and in the subfield of nuclear magnetic resonance (NMR) spectroscopy. This research is designed to study the utility of combining magic angle spinning (MAS) of dilute spins like carbon-13 with the sensitivity of abundant spins like protons by spatial localization methods combined with high-power cross-polarization and proton decoupling. It is further proposed that the use of an appropriate pulse sequence, in combination with an rf gradient, should permit rare spin NMR spectra of localized regions of a given sample. Thus, the overall goal of this research is to obtain chemical information from an NMR spectrum within a selected region of a sample. Such an approach should have applications in many areas of chemical research including 1) organic solids and polymers, 2) reactions at interfaces, 3) isotopically labeled molecules doped into porous materials, 4) layered materials, and 5) devices subject to defects cracks or other imperfections. This five year continuing grant to the University of California at Irvine for the support of Professor Shaka as a Presidential Young Investigator is designed to promote his rapid and effective growth as an independent researcher in the area of solid state NMR spectroscopy.