Refocusing pulses: A strategy to improve efficiency of phase-modulated heteronuclear decoupling schemes in MAS solid-state NMR

Mukul G. Jain, K. N. Sreedevi, Asif Equbal, P. K. Madhu, Vipin Agarwal

Research output: Contribution to journalArticlepeer-review

Abstract

The strategy of using π pulses in conjunction with continuous-wave radio-frequency fields to refocus spin interactions has lead to robust and efficient family of heteronuclear decoupling schemes in magic-angle spinning solid-state NMR, denoted as, rCW schemes. Here, we investigate the generality of the application of such refocussing pulses in other phase-modulated decoupling schemes, notably the super-cycled XiX decoupling. XiX is a commonly used heteronuclear decoupling scheme under conditions of fast MAS and low-amplitude radio-frequency irradiation. The refocussing of interactions is achieved by inserting π pulses with a phase of 135° in the supercycled XiX scheme. The refocussed XiX, rXiX, scheme has improved decoupling efficiency, better offset tolerance, and easier experimental setup compared to the XiX scheme.

Original languageEnglish (US)
Pages (from-to)59-65
Number of pages7
JournalJournal of Magnetic Resonance
Volume284
DOIs
StatePublished - Nov 2017

Keywords

  • AM-XiX
  • Amplitude modulation
  • Heteronuclear dipolar decoupling
  • Magic-angle spinning
  • rXiX
  • SC-AM-XiX
  • Solid-state NMR
  • XiX

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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