Dipolar and scalar 3He and 129Xe frequency shifts in mm-sized cells
Abstract
We describe a 3He-129Xe comagnetometer operating in stemless anodically bonded cells with a 6 mm3 volume and a 129Xe spin coherence time of 300 sec. We use a 87Rb pulse-train magnetometer with co-linear pump and probe beams to study the nuclear spin frequency shifts caused by spin polarization of 3He. By systematically varying the cell geometry in a batch cell fabrication process we can separately measure the cell shape dependent and independent frequency shifts. We find that a certain aspect ratio of the cylindrical cell can cancel the effects of 3He magnetization that limit the stability of vapor-cell comagnetometers. Using this control we also observe for the first time a scalar 3He-129Xe collisional frequency shift characterized by an enhancement factor HeXe = -0.0110.001.
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