By Mark E. Limes
This thesis describes longitudinal nuclear rest measurements of reliable 129Xe close to seventy seven okay with formerly not possible reproducibility, and demonstrates adjustments in rest, based upon the way the cast is condensed. those effects are at once acceptable to the new release and garage of enormous amounts of hyperpolarized 129Xe for numerous functions, corresponding to lung magnetic resonance imaging (MRI). The thesis encompasses a subtle theoretical method of those information units, together with changes to a well-established Raman-phonon scattering concept which may clarify the bigger scatter in and discrepancies with past work.
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Extra resources for 129 Xe Relaxation and Rabi Oscillations
This is expected because it is difficult to determine the potential of xenon in a lattice; the gaseous xenon potential also remains not well known. 10) matches closely with Yen and Norberg’s chemical shift data for 129 Xe. In 1967, Warren and Norberg present an extensive study of T2 for solid 129 Xe and 131 Xe . A second moment (and in turn T2 ) for 129 Xe is found that is approximately the same as the theoretical second moment found with Van Vleck’s theory of dipolar broadening in a rigid lattice .
Because of these unexpectedly short times, there was a need to understand the mechanism of relaxation in this system. In the following sections, a brief history of theoretical and experimental results is presented as a companion for a reader delving through the literature. As such, notational changes are abundant but clearly labeled after each equation. 1 discusses the history of the theory in conjunction with the history of the experiments. Then, a discussion of more recent experimental results is given in Sect.
Certain experimental results, such as the chemical shift data, remain unexplained at the end of the first wave of papers. In this brief history, it is seen exactly how reproducibility and theoretical determination is a significant problem when concerning solid xenon. 2 Reincarnation via Hyperpolarization The early work has a lack of solid 129 Xe longitudinal relaxation data without impurities such as oxygen. This deficiency comes from a practical problem—for conventional solid NMR measurements, the relaxation times are too long for 129 Xe for an extensive study to be worthwhile; all of the experiments in the early work monitored thermal polarization and, with T1 times for 129 Xe reaching upwards of hours, a T1 measurement was presumably determined too long to be practical.
129 Xe Relaxation and Rabi Oscillations by Mark E. Limes