Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa51b..04j&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA51B-04
Physics
6015 Dust, 6025 Interactions With Solar Wind Plasma And Fields, 6045 Physics And Chemistry Of Materials, 6213 Dust
Scientific paper
Field ion emission is one of the most interesting processes in dusty plasma science. This process limits the maximum positive charge and electric field intensity at the dust grain surface. In our laboratory, we carry out experimental simulations of dust charging processes. Our setup is based on electrodynamic quadrupole trap where we are able to hold a single dust particle for a long time (typically tens of hours). The grain bombardment by the ion beam results in its charging to a high positive potential. The charge is then released by field ion emission. We have studied many discharging characteristics from conductive dust grains charged by ions of several gasses with energies up to 10 keV. We have found that the field ion emission depends on many factors (i.e., ion beam energy, ion mass, total dose of ion bombarding, and history of dust grain charging). In the contribution, we discuss aforementioned effects and their importance for the processes in the interplanetary space.
Jerab M.
Nemecek Zdenek
Pavlu Jiri
Richterova I.
Safrankova Jana
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