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Download 129 Xe Relaxation and Rabi Oscillations by Mark E. Limes PDF

By Mark E. Limes

This thesis describes longitudinal nuclear rest measurements of strong 129Xe close to seventy seven okay with formerly unimaginable reproducibility, and demonstrates modifications in leisure, established upon the way the cast is condensed. those effects are without delay acceptable to the new release and garage of enormous amounts of hyperpolarized 129Xe for varied functions, resembling lung magnetic resonance imaging (MRI). The thesis incorporates a refined theoretical method of those facts units, together with changes to a well-established Raman-phonon scattering idea that could clarify the bigger scatter in and discrepancies with prior work.

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Extra info for 129 Xe Relaxation and Rabi Oscillations

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2 A compilation of temperature-dependent solid 129 Xe T1 values is shown. Data is taken from [80–84] at listed magnetic field values is shown. Higher temperature data at low field values are shorter than 20 min due to the onset of vacancy diffusion relaxation, and therefore left out of plot. Inset Extended temperature range of solid 129 Xe T1 times from [81, 82] for the paramagnetic impurity and 129 Xe, Hn ≈ γI hN ¯ I is the nuclear linewidth due to spin-spin interactions in the rigid lattice, T1e is the relaxation of the electronic spin S, and H0 is the external magnetic field.

In 1981, Granfors et al. published x-ray data of high-pressure, single-crystal solid xenon [98]. 64) The relationship between the lattice √ parameter b and the nearest neighbor in an fcc lattice (such as xenon) is R0 = b/ 2. The other temperature-dependent parameter accounted for in the calculation by Kuzma et al. [83], and presumably in the works Fitzgerald et al. [92] and Gatzke et al. [82] (it is mentioned in Gatzke [81], but not written explicitly), is the strength of the spin-rotation interaction at equilibrium lattice spacing, cK0 .

With thermal polarization measurements, large flip angles and perhaps averaging are needed to see a sufficient pulsed-NMR signal of 129 Xe at higher temperatures. A large flip angle means the method of finding T1 is limited to typical T1 NMR measurement techniques: inversion recovery, saturation recovery, etc. [31, 32, 79]. In each of these conventional NMR techniques, the first step is (typically) to wait many times T1 so that the sample 20 2 Longitudinal Relaxation in Solid 129 Xe has maximum thermal polarization.

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