By Mark E. Limes
This thesis describes longitudinal nuclear leisure measurements of sturdy 129Xe close to seventy seven okay with formerly impossible reproducibility, and demonstrates alterations in leisure, based upon the way the cast is condensed. those effects are without delay acceptable to the iteration and garage of enormous amounts of hyperpolarized 129Xe for numerous purposes, corresponding to lung magnetic resonance imaging (MRI). The thesis encompasses a refined theoretical method of those information units, together with differences to a well-established Raman-phonon scattering thought which could clarify the bigger scatter in and discrepancies with earlier work.
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Extra resources for 129 Xe Relaxation and Rabi Oscillations
The appendices include calculations of transition probabilities in Rb optical pumping, and dilute-spin solid 129 Xe data regarding transverse relaxation. Appendix C discusses research on the relaxation mechanisms in gaseous 129 Xe. Here, an unexpected temperature dependence on longitudinal relaxation time of 129 Xe is investigated. Chapter 2 Longitudinal Relaxation in Solid 129 Xe As if that blind rage had washed me clean, rid me of hope; for the first time, in that gentle indifference of the world.
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. Therefore, one data point to map out the characteristic T1 curve takes multiples of T1 . T1 measurements using hyperpolarization techniques typically record 50–150 points over the course of one experiment; to get the same resolution using thermal polarization techniques, the time required is Thermal Polarization Run Time = (Time per data point) ∗ (Data points) = (4( ± 1)T1 ) ∗ (100 ± 50) = (400 ± 200) ∗ T1 .
30) where Sν is the displacement from equilibrium. 31) kj † in terms of phonon creation and annihilation operators akj and akj , where hk ¯ is the phonon momentum and xj is a unit vector. The crystal contains N atoms with mass M in a volume V , with N phonon states of a given polarization. Defining Nβα to be the angular momentum of the β and α atoms in the crystal about their center of mass, the spin-rotation interaction of Eq. 19 can be written as v= cK (Rβα )Nβα · K = β 1 2h¯ cK (Rβα )Rβα × Pβα · K.
129 Xe Relaxation and Rabi Oscillations by Mark E. Limes