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

By Mark E. Limes

This thesis describes longitudinal nuclear leisure measurements of strong 129Xe close to seventy seven ok with formerly unimaginable reproducibility, and demonstrates variations in rest, established upon the best way the forged is condensed. those effects are at once acceptable to the new release and garage of huge amounts of hyperpolarized 129Xe for varied purposes, comparable to lung magnetic resonance imaging (MRI). The thesis incorporates a refined theoretical method of those info units, together with differences to a well-established Raman-phonon scattering idea 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

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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. 2 History of the Problem 29 Here, a general operator Aβα is defined by Aβα = Aβ − Aα , as well as Rβα = (0) (0) Rβα + Sβα .

Thus, any average over crystal orientation yields the same result given in Eq. 2 History of the Problem 35 and there arises a profound consequence of this theory—there is no dependence on the crystal structure or orientation as long as it can be assumed that a majority of the atoms reside in an fcc lattice with a sufficiently uniform polarization. Mesoscopic or macroscopic variations in grain size or crystal orientation should therefore not affect the observed T1 time, unless the phonon occupation numbers are somehow affected by this varying of grain size.

In 2002 [83]. Therein, pulsed-NMR techniques are used for measurement [90] instead of the adiabatic-fast-passage measurements used in the Princeton group’s previous work. The dominant region for the theory of Raman-scattering mediating the spin-rotation interaction is narrowed from 20–120 to 50–120 K, and below 50 K it is stated that cross relaxation to 131 Xe becomes the dominant relaxation mechanism for 129 Xe. 435 T. 2 % 131 Xe). 435 T) temperature sweep from 77 to 120 K gives T1 ’s that are in the vicinity of Gatzke and Cates’ values.

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