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J. Chem. Phys. 124, 214107 (2006); http://dx.doi.org/10.1063/1.2194905 (13 pages)

Multipole-multimode Floquet theory of rotational resonance width experiments: mathmath distance measurements in uniformly labeled solids

Ramesh Ramachandran, Józef R. Lewandowski, Patrick C. A. van der Wel, and Robert G. Griffin

Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

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(Received 3 February 2006; accepted 20 March 2006; published online 7 June 2006)

A formal description of zero-quantum (ZQ) NMR processes using multipole-multimode Floquet theory is proposed for studying polarization transfer in magic angle spinning experiments. Specifically, we investigate the factors affecting the accuracy and precision of mathmath distance measurements that are based on ZQ-magnetization exchange processes in rotational resonance width experiments. With suitable examples drawn from measurements in N-acetyl-[U-math,math]-L-valine-L-leucine, we substantiate our approach and propose methods for improving the accuracy and reliability of such mathmath distance measurements in uniformly math, math-labeled solids. In addition, the theoretical model presented in this article provides a more general framework for describing relaxation phenomena involving multiple decay rate constants in zero-quantum processes.

© 2006 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THEORY
    1. Basic theory
    2. Spin dynamics using the MMFT approach
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

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0021-9606 (print)  
1089-7690 (online)

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