Interaction of Dust Particles with Electrons and Ions
Submicron sized dust particles (SiO2 and tungsten) were levitated in an electrodynamic quadrupole field and charged by ions and electrons. The electric particle surface potential is limited, when charged with ions, at field strength of approx. 1×109 V/m by a temperature dependent discharge mechanism. The particle interaction with 2 to 20 keV electrons always leads to positive surface potentials. The particle potential is determined by the absorption i.e. transmission and backscattering of electrons and by the secondary electrons emission. The dependences of the surface potentials and of the absorption on the electron energy were measured.
KeywordsDust Particle Glass Particle Field Ionization Tungsten Particle Secondary Electron Emission
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