3He polarization-dependent EPR frequency shifts of alkali-metal-3He pairs -: art. no. 013414

We present temperature-dependent measurements of the EPR frequency shifts for Na, K, and Rb interacting with polarized He-3. K and Na frequency shifts were measured via comparison with Rb frequency shifts (well known at low temperatures) in Na-Rb -He-3 and K-Rb -He-3 spin-exchange cells. The lowered Rb vapor pressure of these "hybrid" spin-exchange cells also allowed us to extend the measured temperature dependence of the Rb EPR frequency shifts up to 350 degreesC. This work presents measurements of the EPR frequency shift for Na in He-3 and significantly extends the temperature range of previous Rb and K EPR frequency shift measurements. These results are critical to the performance of accurate He-3 EPR polarimetry in spin-exchange cells.