Phys. Rev. Lett. 84, 6034–6037 (2000)Photoelectric Charging of Dust Particles in Vacuum
See accompanying Physics Focus 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 μm in diameter and are composed of Zn, Cu, graphite, and glass. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.6034
DOI:
10.1103/PhysRevLett.84.6034
PACS:
52.25.Zb, 94.10.Nh, 95.30.Wi, 96.50.Dj
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