HR: 17:20h
AN: SA54A-04    [Abstracts]
TI: Sputtering of Dust Grains: Experiment and Modeling
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: 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: Nemecek, Z
EM: zdenek.nemecek@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
AB: The dust grain sputtering is an important process in the space but it cannot be studied in situ. For this reason, we have simulated the sputtering of dust grains of various materials under bombardment of different ions with various energies up to 10 keV in laboratory conditions. We have found that the sputtering yield can be probably enhanced by the presence of a high electric field at the grain surface. Moreover, we have prepared a simple sputtering model that fits well the results of our experiment and applied on space environment. From a comparison of the model and experiment it follows that (1) the shape of grains exposed to a collimated ion beam evolves from sphere to ellipsoid and this change may influence the sputtering yield; (2) the consideration based on the mean abundance of heavy ions in the solar wind leads to a conclusion that these minor species can considerably contribute to the sputtering rate.
DE: 2129 Interplanetary dust
DE: 2461 Plasma interactions with dust and aerosols (7849)
DE: 5759 Rings and dust
DE: 6015 Dust
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly