Increased efficiency of coherence transfer in cross-polarization NMR from quadrupolar nuclei: Dynamic-angle cross-polarization

C. A. Fyfe, K. C. Wong-Moon, H. Grondey, Karl Todd Mueller

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Abstract

In this work we describe the increased efficiency obtained in solid-state coherence-transfer NMR experiments involving quadrupolar nuclei by carrying out cross-polarization while the sample is spinning along an axis parallel to the magnetic field. After the cross-polarization step, the spinning axis is rapidly switched to the "magic angle" for detection of a high-resolution free induction decay from the target nuclei. The increased efficiency of the cross-polarization process, coupled with the superior resolution available from magic-angle sample spinning, is useful for obtaining high-resolution NMR spectra of slowly-relaxing spin species in condensed phases. A specific example illustrating this method is drawn from the cross-polarization of magnetization from aluminum-27 spins to phosphorus-31 spins in the large-pore aluminophosphate VPI-5.

Original languageEnglish (US)
Pages (from-to)2139-2142
Number of pages4
JournalJournal of Physical Chemistry
Volume98
Issue number8
DOIs
Publication statusPublished - Jan 1 1994

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

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