HR: 0800h
AN: SA51B-04    [Abstracts]
TI: Laboratory Simulation of Field Ion Emission From Dust Grains
AU: * Jerab, M
AF: Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Prague, 180 00, Czech Republic
AU: Richterova, I
EM: Ivana.richterova@mff.cuni.cz
AF: Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Prague, 180 00, Czech Republic
AU: Pavlu, J
EM: jiri.pavlu@mff.cuni.cz
AF: Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Prague, 180 00, Czech Republic
AU: Safrankova, J
EM: jana.safrankova@mff.cuni.cz
AF: Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Prague, 180 00, Czech Republic
AU: Nemecek, Z
EM: zdenek.nemecek@mff.cuni.cz
AF: Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, Prague, 180 00, Czech Republic
AB: 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.
DE: 6015 Dust
DE: 6025 Interactions with solar wind plasma and fields
DE: 6045 Physics and chemistry of materials
DE: 6213 Dust
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly