, T.
and Saam, B.
(2012),
Comment on "Pressure dependence of wall relaxation in polarized He3 gaseous cells", Physical Review A, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909727
(Accessed April 30, 2025)
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Comment on "Pressure dependence of wall relaxation in polarized He3 gaseous cells"
Published
Author(s)
, B Saam
Abstract
W. Zheng et al. [Phys. Rev. A 83, 061401(R) (2011)] measure under certain conditions a linear pressure dependence of the wall-induced nuclear relaxation rate of 3He in glass cells typically used to generate and/or store hyperpolarized 3He. Their interpretation is that this linear dependence is a general characteristic of paramagnetic wall relaxation, regardless of the relationship between the diffusion time tau_d across the cell and the longitudinal nuclear relaxation time T1. The authors'proposed modi¯cation of the polarization diffusion equation to account for this dependence cannot be valid for T1 >> tau_d, which holds for all of their measurements. Numerous previous studies support a broadly valid pressure-independent model for wall relaxation. The likely explanation for the linear dependence observed by the authors is diffusion through a capillary to a re¯lling valve that has a much higher probability per collision to relax 3He.Citation
Physical Review A
Pub Type
Journals
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Keywords
3He, linear pressure dependence, nuclear relaxation
Citation
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Created April 26, 2012, Updated June 2, 2021