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Hadamard NMR spectroscopy in solids.

Jun Ashida1, Eriks Kupce, Jean-Paul Amoureux

  • 1Varian Technologies Japan Ltd., Tokyo, Japan.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 4, 2005
PubMed
Summary

Frequency domain Hadamard encoding significantly reduces solid-state Nuclear Magnetic Resonance (NMR) experiment times. This method, demonstrated in carbon-13 enriched samples, enables faster data acquisition for advanced NMR techniques.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Quantum information processing

Background:

  • Traditional 2D and 3D NMR experiments in solids are time-consuming.
  • Achieving high-resolution structural information from solid samples requires lengthy experimental procedures.

Purpose of the Study:

  • To significantly accelerate the acquisition time of solid-state NMR experiments.
  • To demonstrate the utility of frequency domain Hadamard encoding for enhancing NMR efficiency.

Main Methods:

  • Implementation of frequency domain Hadamard encoding using long selective pulses.
  • Sequential application of Hadamard encoding pulses to prevent multiple quantum interferences.
  • Application to carbon-13 enriched solid samples.

Main Results:

  • Demonstrated reduction in experiment duration by several orders of magnitude.
  • Successful application of Hadamard encoding in (13)C enriched solids.
  • Validation of the method for advanced NMR techniques like dipolar assisted rotational resonance and NOESY build-up rate measurements.

Conclusions:

  • Frequency domain Hadamard encoding is a powerful technique for accelerating solid-state NMR.
  • This approach opens possibilities for faster structural and dynamic studies in solid materials.
  • The sequential pulse application effectively mitigates interference issues, enhancing reliability.

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