High-precision determination of the frequency-shift enhancement factor in Rb-129Xe
Abstract
We report a measurement of the dimensionless enhancement factor 0 for the Rb-129Xe pair commonly used in spin exchange optical pumping (SEOP) to produce hyperpolarized 129Xe. 0 characterizes the amplification of the 129Xe 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 3He and 129Xe and relies on the previously measured value of 0 for the Rb-3He pair. The measurement is based on (1) the optically detected (Faraday rotation) frequency shift of the 87Rb 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 (0) RbXe = 518 8, in good agreement with previous measurements and theoretical estimates but with improved precision.
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