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Solid-State NMR Experiments with Powder Dephased States and Phase Modulated Pulse Sequences.

机译:粉末相态和相调制脉冲序列的固态NMR实验。

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摘要

In this thesis, we study model problems that capture the essence of dipolar re-coupling in magic angle spinning NMR (nuclear magnetic resonance) spectroscopy. We also address the problem of ensemble control where elements of an ensemble show variation in parameters that govern the system dynamics and make control and measurement difficult. We provide explicit methods to overcome and compensate dispersions across the ensemble using composite pulse sequences, phase modulation, and adiabatic passage. The methodologies developed are used to design novel pulse sequences that make heteronuclear and homonuclear recoupling experiments broadband and insensitive to rf inhomogeneity and anisotropic interactions. We finally incorporate these experiments into multidimensional solid-state NMR experiments that use powder dephased antiphase coherence (gamma preparation) to encode chemical shift information. This allows for the complete transfer of transverse magnetization giving improvements in sensitivity and resolution. Experimental confirmation of these results are obtained from a variety of molecular systems.
机译:在本文中,我们研究了模型问题,这些问题捕获了魔角旋转NMR(核磁共振)光谱中偶极重新耦合的本质。我们还解决了集成控制的问题,集成的元素显示出控制系统动力学的参数变化,从而使控制和测量变得困难。我们提供了使用复合脉冲序列,相位调制和绝热通道来克服和补偿整体色散的明确方法。所开发的方法用于设计新颖的脉冲序列,使异核和同核再耦合实验更宽带,并且对射频不均匀性和各向异性相互作用不敏感。最后,我们将这些实验并入多维固态NMR实验中,该实验使用粉末相变的反相相干性(γ制备)来编码化学位移信息。这样可以完全转移横向磁化强度,从而提高灵敏度和分辨率。这些结果的实验​​确认是从多种分子系统中获得的。

著录项

  • 作者

    Lin, James Jeng-tai.;

  • 作者单位

    Harvard University.;

  • 授予单位 Harvard University.;
  • 学科 Chemistry Physical.;Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 165 p.
  • 总页数 165
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:36:48

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