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Variations in the electrostatic surface potential between the proof mass andelectrode housing in the space-based gravitational wave mission LISA is one ofthe largest contributors of noise at frequencies below a few mHz. Torsionbalances provide an ideal testbed for investigating these effects in conditionsemulative of LISA. Our apparatus consists of a Au coated Cu plate brought neara Au coated Si plate pendulum suspended from a thin W wire. We have measured awhite noise level of $30, \uVhz$ above approximately 0.1, mHz, rising at lowerfrequencies, for the surface potential variations between these two closelyspaced metals.

Temporal Extent of Surface Potentials between Closely Spaced Metals