Robust solid 129Xe longitudinal relaxation times
Abstract
We find that if solid xenon is formed from liquid xenon, denoted "ice", there is a 10% increase of 129Xe longitudinal relaxation T1 time (taken at 77 K and 2 Tesla) over a trickle-freeze formation, denoted "snow". Forming xenon ice also gives unprecedented reproducibility of 129Xe T1 measurements across a range of 77-150 K. This temperature dependence roughly follows the theory of spin-rotation mediated by Raman scattering of harmonic phonons (SRRS), though it results in a smaller-than-predicted spin-rotation coupling strength cK0/h. Enriched ice 129Xe T1 experiments show no isotopic dependence in bulk relaxation mechanisms at 77 K and at kilogauss fields.
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