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arXiv · 1904.11562

High-precision determination of the frequency-shift enhancement factor in Rb-$^{129}$Xe

A. I. Nahlawi·Z. L. Ma·M. S. Conradi·B. Saam
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Abstract

We report a measurement of the dimensionless enhancement factor $κ_0$ for the Rb-$^{129}$Xe pair commonly used in spin exchange optical pumping (SEOP) to produce hyperpolarized $^{129}$Xe. $κ_0$ characterizes the amplification of the $^{129}$Xe magnetization contribution to the Rb electronic effective field, compared to the case of a uniform continuous medium in classical magnetostatics. The measurement is carried out in Rb vapor cells containing both $^3$He and $^{129}$Xe and relies on the previously measured value of $κ_0$ for the Rb-$^3$He pair. The measurement is based on (1) the optically detected (Faraday rotation) frequency shift of the $^{87}$Rb EPR hyperfine spectrum caused by the SEOP nuclear polarization and subsequent sudden destruction of nuclear polarization of both species and (2) a comparison of NMR signals for the two species acquired just prior to the EPR frequency shift measurements. We find $(κ_0)_{\rm RbXe} = 518\pm 8$, in good agreement with previous measurements and theoretical estimates but with improved precision.

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A. I. Nahlawi, Z. L. Ma, M. S. Conradi, B. Saam. 2019-10-24. High-precision determination of the frequency-shift enhancement factor in Rb-$^{129}$Xe. https://doi.org/10.1103/physreva.100.053415

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