Abstract
We present measurements of the frequency shift of the Rb electron-paramagnetic-resonance (EPR) line in the presence of nuclear-polarized $^{3}\mathrm{He}$ gas for the temperature range of 30 to 85 \ifmmode^\circ\else\textdegree\fi{}C. The frequency shift is due to the Fermi-contact interaction between the Rb valence electron and the polarized $^{3}\mathrm{He}$ nucleus. Expressions for both the frequency shift and the spin-exchange cross section are derived in terms of the strength of this contact interaction. From these expressions and the measured frequency shift, we estimate the Rb${\mathrm{\ensuremath{-}}}^{3}$He spin-exchange cross section. The Rb EPR frequency shift, which is 53 kHz for a 100% polarized 10-amagat $^{3}\mathrm{He}$ sample at 50 \ifmmode^\circ\else\textdegree\fi{}C, can be used to determine the absolute polarization of nuclear polarized $^{3}\mathrm{He}$ targets. From these measurements, one can also predict the shift of the $^{3}\mathrm{He}$ NMR line due to a polarized Rb vapor.
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