Measurements of dipole moments and a Q-patch model of collisionally charged grains
Identical glass spheres of 434±17μm diameter are charged in collisions among each other. Atslow speed some form dimers under microgravity and oscillate within the electrical field of acapacitor. The dipole moments deduced from these oscillations are large. They cannot beexplained by the net charges measured for each grain (up to±3×105e) and show no significantdependence on the net charge in the given range. This requires a highly non-homogeneous chargedistribution on the grain surface. We simulate heterogeneous charging with a Q-patch chargingmodel in agreement to the experimental data.
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