Spontaneous Discharging of Carbon and Glass Dust

Details Spontaneous Discharging of Carbon and Glass Dust Spontaneous Discharging of Carbon and Glass Dust

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p41c1637v&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P41C-1637

Physics

[6045] Planetary Sciences: Comets And Small Bodies / Physics And Chemistry Of Materials, [6207] Planetary Sciences: Solar System Objects / Comparative Planetology, [6025] Planetary Sciences: Comets And Small Bodies / Interactions With Solar Wind Plasma And Fields

Scientific paper

Micrometer-sized bodies (dust) coexist with plasma of various parameters in the space as well as in laboratories and industrial facilities. The mutual interactions of plasma particles with dust grains lead to their charging. Especially small or irregularly shaped grains can achieve a high surface electric field even under the moderate potential. When the positive electric field is strong, the accumulated charge becomes spontaneously released. This process is known as field ion emission and can limit a maximum charge of the grain exposed to the plasma environment. We study this process experimentally under laboratory conditions using single spherical glassy carbon and glass grains trapped in the electrodynamic quadrupole. We have investigated relative contributions of the field ionization of the surrounding gas, the gas leaving the grain surface due to desorption, and atoms that were already implanted to the grain in course of ion bombardment. We have found that the probability of ionization of particles leaving the grain surface is significantly higher than that of the surrounding gas. The contribution of the field evaporation of the grain bulk material was found to be negligible.

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