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We report on the measurement of a Larmor frequency shift proportional to theelectric-field strength for $^{199}{\rm Hg}$ atoms contained in a volumepermeated with aligned magnetic and electric fields. This shift arises from theinterplay between the inevitable magnetic field gradients and the motionalmagnetic field. The proportionality to electric-field strength makes itapparently similar to an electric dipole moment (EDM) signal, although unlikean EDM this effect is P- and T-conserving. We have used a neutron magneticresonance EDM spectrometer, featuring a mercury co-magnetometer and an array ofexternal cesium magnetometers, to measure the shift as a function of theapplied magnetic field gradient. Our results are in good agreement withtheoretical expectations.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Measurement of a false electric dipole moment signal from $^{199}$Hg atoms exposed to an inhomogeneous magnetic field