Novel Two-Dimensional Methods that Combine Single-Quantum Cross-Polarization and Multiple-Quantum MAS of Quadrupolar Nuclei

Sharon Elizabeth Ashbrook, Stephen Wimperis

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

A new approach to combining cross-polarization with multiple-quantum MAS in a two-dimensional NMR experiment is demonstrated, involving cross-polarization from H-1 to the single-quantum coherences of a quadrupolar nucleus. These coherences are then converted directly to multiple-quantum coherences rather than via a population state. In two separate methods, pure-absorption lineshapes are obtained using a z-filter and a shined echo, respectively, with the latter, a 'reversed split-t(1)' method, demonstrated to be particularly effective. The efficiency of both sequences may be improved by incorporating 'fast-amplitude-modulation' (FAM) pulses for both the conversion and excitation of triple-quantum coherences. (C) 2001 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)500-508
Number of pages9
JournalChemical Physics Letters
Volume340
DOIs
Publication statusPublished - 8 Jun 2001

Keywords

  • ANGLE-SPINNING NMR
  • HETERONUCLEAR DIPOLAR INTERACTIONS
  • MQMAS NMR
  • AMPLITUDE-MODULATION
  • MAGNETIC-RESONANCE
  • SPIN-5/2 NUCLEI
  • TRIPLE
  • SOLIDS
  • SPECTRA
  • SYSTEMS

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