, T.
, Hayden, M.
, Nacher, P.
, Petukhov, A.
, Saam, B.
and Walker, T.
(2013),
Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized <sup>3</sup>He in the presence of <sup>4</sup>He", Physical Review A
(Accessed October 27, 2025)
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Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized 3He in the presence of 4He"
Published
Author(s)
, M E. Hayden, P.J. Nacher, A K. Petukhov, B Saam, T G. Walker
Abstract
H.H. Chen et al [1] claim that adding 4He to spin-exchange optical pumping (SEOP) cells confines 3He atoms to a diffusion-limited region, which effectively reduces the wall relaxation factor X. Here X is a phenomenological parameter used to characterize typical SEOP cells; it quantifies the observation that the measured linear slope of the relaxation rate with alkali density exceeds the spin-exchange rate. In addition they claim to demonstrate that magnetic field gradients cause a diffusive motion of 3He. We argue that these claims and other central conclusions drawn by the the authors of [1] are unjustified and/or unphysical. We also draw attention to several additional issues and shortcomings associated with the results, analysis, and presentation of data in [1] that confound clear interpretation."Citation
Physical Review A
Pub Type
Journals
Keywords
He3, He4, spin-exchange optical pumping
Citation
Issues
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Created July 24, 2013, Updated February 19, 2017