Collisional ${}^3$He and ${}^{129}$Xe frequency shifts in Rb--noble-gas mixtures

Abstract

The Fermi-contact interaction that characterizes collisional spin exchange of a noble gas with an alkali-metal vapor also gives rise to NMR and EPR frequency shifts of the noble-gas nucleus and the alkali-metal atom, respectively. We have measured the enhancement factor ${\kappa }_0$ that characterizes these shifts for Rb-${}^{129}$Xe in the high-pressure limit to be 493$\pm$31, making use of the previously measured value of ${\kappa }_0$ for Rb-${}^3$He. This result allows accurate ${}^{129}$Xe polarimetry with no need to reference a thermal-equilibrium NMR signal.

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