Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized 3He in the presence of 4He"

Published

July 24, 2013

Author(s)

Thomas R. Gentile, 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

, T. , Hayden, M. , Nacher, P. , Petukhov, A. , Saam, B. and Walker, T. (2013), Comment on "Enhanced polarization and mechanisms in optically pumped hyperpolarized ³He in the presence of ⁴He", Physical Review A (Accessed April 25, 2024)