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Broad-Band DREAM Recoupling Sequence.

Kong Ooi Tan1, Anders B Nielsen1, Beat H Meier1

  • 1Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland.

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|August 18, 2015
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Summary
This summary is machine-generated.

A new XiX(CW) DREAM sequence enhances dipolar recoupling by widening the bandwidth, making radiofrequency carrier frequency selection less critical for experiments.

Keywords:
dipolar recouplingdistance measurementsmagic angle spinningsolid-state NMRstructure determination

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Advanced pulse sequence development

Background:

  • Dipolar recoupling is crucial for structural studies in solid-state NMR.
  • The DREAM (Decoupling-Enhanced All-purpose recoupling) sequence is a widely used method.
  • Limitations exist in the bandwidth and carrier frequency sensitivity of existing sequences.

Purpose of the Study:

  • To develop a broader bandwidth version of the DREAM sequence.
  • To improve the robustness of dipolar recoupling experiments against carrier frequency misplacement.

Main Methods:

  • Modification of the DREAM sequence by incorporating a phase-alternating radiofrequency irradiation scheme (XiX pulses).
  • Analysis of recoupling conditions and effective Hamiltonian using triple-mode Floquet theory.
  • Performance evaluation through numerical simulations and experimental validation on model compounds and ubiquitin.

Main Results:

  • The novel XiX(CW) DREAM sequence demonstrates a significantly wider recoupling bandwidth compared to the original DREAM sequence.
  • Experimental and simulation results confirm the enhanced performance.
  • The broader bandwidth reduces the critical dependence on precise carrier frequency positioning.

Conclusions:

  • The XiX(CW) DREAM sequence offers an improved approach for dipolar recoupling in solid-state NMR.
  • This advancement facilitates more reliable and less sensitive experimental setups.
  • The sequence is a valuable tool for structural elucidation of biomolecules and materials.