The Study of Field Ion Emission from Gold Dust Grains

Details The Study of Field Ion Emission from Gold Dust Grains The Study of Field Ion Emission from Gold Dust Grains

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..799..387j&link_type=abstract

NEW VISTAS IN DUSTY PLASMAS: Fourth International Conference on the Physics of Dusty Plasmas. AIP Conference Proceedings, Volum

Physics

Dusty Plasmas, Astrophysical Plasma, Cosmic Dust, Ionisation, Dusty Or Complex Plasmas, Plasma Crystals, Laboratory Studies Of Space- And Astrophysical-Plasma Processes, Emission, Absorption, And Scattering Of Particles, Ionization Of Plasmas

Scientific paper

Dust grains in a space and accordingly in our laboratory simulation are charged by various processes. An impact of energetic ions leads to deposition of the positive charge on the grain. This effect increases the grain potential and the electric field at grain surface up to a threshold. When the threshold is reached, accumulated charge becomes spontaneously released. This discharging current was usually attributed to field ionization of a gas surrounding the grain or ion field evaporation of the grain material and thus it would be a function of the surface potential only. However, our previous study indicated that the main process discharging dust grains charged by the ion beam is the field desorption of beam ions deposited on the grain surface.
The paper continues mentioned studies. We have used spherical Au grains and exposed them to a beam of He ions that charged the grain to high positive potentials. We have found that the discharging current is determined not only by the surface field intensity but it strongly depends on the structure of the grain surface.

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