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Published July 1, 1993 | public
Journal Article Open

Polarization-dependent frequency shifts from Rb-3He collisions


We present measurements of the frequency shift of the Rb electron-paramagnetic-resonance (EPR) line in the presence of nuclear-polarized 3He gas for the temperature range of 30 to 85 °C. The frequency shift is due to the Fermi-contact interaction between the Rb valence electron and the polarized 3He 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-3He spin-exchange cross section. The Rb EPR frequency shift, which is 53 kHz for a 100% polarized 10-amagat 3He sample at 50 °C, can be used to determine the absolute polarization of nuclear polarized 3He targets. From these measurements, one can also predict the shift of the 3He NMR line due to a polarized Rb vapor.

Additional Information

©1993 The American Physical Society. Received 3 August 1992. We gratefully acknowledge many helpful and encouraging discussions with Will Happer and Thad Walker. This research was supported by Air Force Office of Scientific Research Grants No. 88-0165 and No. F49620-92-5-0211.


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