Photoelectric charging of dust particles in vacuum.
Photoelectric charging measurements are presented of dust grains in vacuum for isolated grains and for grains near a photoemissive surface. Isolated grains reach a positive-equilibrium floating potential, dependent upon the work function of the particle, which causes the emitted electrons to be returned. Grains dropped past a photoemitting surface reach a negative floating potential for which the sum of the emitted and collected currents is zero. The particles tested are 90-106 microm in diameter and are composed of Zn, Cu, graphite, and glass.
Sickafoose
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Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80309-0392, USA.
Colwell
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JE
Horányi
M
M
Robertson
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S