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Surface NMR Using Laser-Polarized 129Xe under Magic Angle Spinning Conditions

Brunner1, Seydoux, Haake

  • 1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 21, 1998
PubMed
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Laser-polarized noble gases enhance surface NMR signals. This study demonstrates magic angle spinning compatibility, enabling spin polarization transfer from xenon-129 to surface protons for enhanced solid-state NMR.

Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR)
  • Surface Science
  • Quantum Optics

Background:

  • NMR signals of surface nuclei in solids can be amplified using spin polarization from laser-polarized noble gases.
  • Previous techniques were incompatible with magic angle spinning (MAS).

Purpose of the Study:

  • To demonstrate the feasibility of using laser-polarized noble gases for surface NMR enhancement under magic angle spinning conditions.
  • To enable selective enhancement of surface nuclear spins for high-resolution multinuclear NMR experiments.

Main Methods:

  • Laser-polarized Xenon-129 (Xe) was introduced into a spinning rotor using helium as a carrier gas under continuous-flow conditions.
  • Xenon adsorption on SiO2 (AEROSIL300) was achieved at 163-173 K.
  • Spin polarization induced Nuclear Overhauser Effect (SPINOE) was observed.

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Main Results:

  • Successful insertion of laser-polarized Xe into a spinning rotor under MAS conditions.
  • Observation of SPINOE from laser-polarized Xe to surface 1H nuclei of SiO2.
  • Demonstration of selective enhancement of surface nuclear spins.

Conclusions:

  • Laser-polarized noble gas NMR is feasible under magic angle spinning.
  • This technique allows for selective enhancement of surface nuclei, paving the way for advanced multinuclear surface NMR.
  • Opens new avenues for studying surface chemistry and materials science with enhanced resolution.