Active nuclear spin maser oscillation with double cell

Uncertainty in the frequency precision of the planned experiment to search for a super(129)Xe atomic electric dipole moment is dominated by drifts in the frequency shift due to contact interaction of super(129)Xe with polarized Rb valence electrons. In order to suppress the frequency shift, a double-cell geometry has been adopted for the confinement of super(129)Xe gas. A new process has been identified to take part in the optical detection of spin precession. The parameters controlling the oscillation of the maser in this new double-cell arrangement were optimized. As a result, the frequency shift has been reduced by a factor of 10 or more from the former single-cell geometry.