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From the same journal

Enhancement of quantum rotor NMR signals by frequency-selective pulses

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Published copy (DOI)

Author(s)

  • Soumya Singha Roy
  • Jean-Nicolas Dumez
  • Gabriele Stevanato
  • Benno Meier
  • Joseph T. Hill-Cousins
  • Richard C. D. Brown
  • Giuseppe Pileio
  • Malcolm H. Levitt

Department/unit(s)

Publication details

JournalJournal of Magnetic Resonance
DateE-pub ahead of print - 20 Nov 2014
DatePublished (current) - Jan 2015
Volume250
Number of pages4
Pages (from-to)25-28
Early online date20/11/14
Original languageEnglish

Abstract

Quantum-rotor-induced polarisation (QRIP) enhancement is exhibited by substances which contain freely rotating methyl groups in the solid state, provided that the methyl groups contain a 13C nucleus. Strong signal enhancements are observed in solution NMR when the material is first equilibrated at cryogenic temperatures, then rapidly dissolved with a warm solvent and transferred into an NMR magnet. QRIP leads to strongly-enhanced 13C NMR signals, but relatively weak enhancements of the 1H signals. We show that the 1H signals suffer from a partial cancellation of degenerate contributions, which may be corrected by applying a frequency-selective π pulse to the inner peaks of the 13C multiplet prior to 1H observation.

    Research areas

  • Hyperpolarisation, Long-lived states, Methyl groups, QRIP, Quantum-rotor-induced polarization, Tunneling

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