Cross polarization and cross relaxation from laser-polarized xenon to surface species

Article Abstract:

A study describes experiments which enhance the potential for using hyperpolarized xenon for surface nuclear magnetic resonance studies. The study observes enhancements of x-nuclei using a nuclear Overhauser effect-based incoherent polarization transfer mechanism under magic angle spinning conditions. The study will show that the polarization transfer between xenon and the carbon or silicon x-nucleus can occur in two ways. Other results are discussed.

Carbon, Silicon, Stereochemistry

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Variable temperatures study of the cross-relaxation dynamics in the hyperpolarized xenon-induced enhancement of surface nuclei

Article Abstract:

The cross-relaxation rate constants for a three spin system involving hyperpolarized 129Xe, 13C, and 1H nuclei have been determined over a wide temperature range (136-216 K) through observation of the polarization enhancements from spin polarization induced nuclear Overhauser effect (SPINOE) experiments. These cross-relaxation rate constants are a function of the xenon hopping correlation time and therefore a function of the xenon surface diffusion.

Industrial Gas Manufacturing, Industrial gases, Xenon, Electric properties, Thermal properties, Polarization (Electricity)

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Substrate and field dependence of the SPINOE transfer to surface 13C from hyperpolarized 129Xe

Article Abstract:

The substrate and field dependencies of surface spin-polarization induced nuclear Overhauser effect (SPINOE) enhancements using optical pumping and magic angle spinning NMR were monitored. It was concluded that the use of hyperpolarized xenon in optical-pumping NMR experiments shown to increase the sensitivity of NMR.

Nuclear magnetic resonance, Chemistry, Physical and theoretical, Physical chemistry, Polarization (Light)

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