✦ LIBER ✦

Relative CSA–Dipolar Orientation from REDOR Sidebands

✍ Scribed by Robert D. O'Connor; Jacob Schaefer

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 223 KB
Volume: 154
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2001.2461

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✦ Synopsis

Algebraic expressions are given for the sideband intensities of REDOR dephasing experiments as a function of the relative orientation of the CSA and dipolar tensors. The expressions are straightforward to derive and implement and can be easily modified for variations in the spin systems, including distributions of distances and multiple dephasers. These expressions, along with the high sensitivity, resolution, and general robust nature of REDOR, make determining CSA-dipolar orientations from REDOR experiments reliable and, compared to full simulations, efficient and routine. Additionally, it is shown that even the +/-1 sidebands of fast-spinning samples may contain significant information about orientation. Finally, numerical integration of the expressions supports the intuitive notion that any difference in the sideband dephasing rates is evidence of preferred CSA-dipolar orientations. This fact can be used to gauge the extent of local molecular order in intermolecular dephasing experiments.

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