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A Magic Angle Spinning Activated 17O DNP Raser.

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Researchers achieved ultra-narrow Nuclear Magnetic Resonance (NMR) line widths using the raser effect. Dynamic Nuclear Polarization (DNP) with magic angle spinning (MAS) enabled this, allowing for precise measurements in Gd-doped ceria.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Dynamic Nuclear Polarization (DNP)
  • Materials Science

Background:

  • The raser effect allows for spontaneous emission of radiofrequency radiation, enabling ultra-narrow NMR line widths without pulsed excitation.
  • Achieving the raser effect requires inducing a large negative magnetization, which has been a significant challenge in NMR.
  • Previous methods for inducing negative magnetization were complex and limited in application.

Purpose of the Study:

  • To demonstrate a method for inducing the large negative magnetization required for the raser effect.
  • To achieve exceptionally narrow NMR line widths using the raser effect in a practical material system.
  • To investigate the role of magic angle spinning (MAS) in controlling the raser effect.

Main Methods:

  • Utilized solid-effect dynamic nuclear polarization (DNP) at high magnetic field and 110 K.
  • Employed isotopically labeled Gadolinium-doped Cerium Dioxide (Gd-CeO2) as the sample material.
  • Investigated the reversible activation and deactivation of the raser effect using magic angle spinning (MAS).

Main Results:

  • Successfully induced a large negative 17O magnetization in Gd-doped CeO2.
  • Measured an ultra-narrow NMR line width of 2 mHz, limited only by magnetic field stability.
  • Demonstrated reversible control over the raser effect by modulating MAS speed.

Conclusions:

  • Solid-effect MAS DNP is an effective technique for enabling the raser effect by inducing large negative nuclear magnetization.
  • The raser effect, facilitated by MAS DNP, allows for unprecedented NMR line width resolution.
  • This approach holds promise for broader applications in other materials and with different nuclei.