title: Photoelectric charging of dust particles in vacuum.
abstract: 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.
authors.affiliation: Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80309-0392, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Sickafoose
authors.forename: J E
authors.initials: JE
authors.lastname: Colwell
authors.forename: M
authors.initials: M
authors.lastname: Horányi
authors.forename: S
authors.initials: S
authors.lastname: Robertson