caa a22 4500 445865911 CHVBK 20180317145457.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1140/epjd/e2011-20077-4 doi (NATIONALLICENCE)springer-10.1140/epjd/e2011-20077-4 Determination of sheath parameters by test particles upon local electrode bias and plasma switching [Elektronische Daten] [G. Schubert, R. Basner, H. Kersten, H. Fehske] Equilibrating gravitation by electric forces, microparticles can be confined in the plasma sheath above suitably biased local electrodes. Their position depends on the detailed structure of the plasma sheath and on the charge that the particles acquire in the surrounding plasma, that is by the electron and ion currents towards it. Bias switching experiments reveal how the charge and equilibrium position of the microparticle change upon altered sheath conditions. Above a critical bias, the particle is subject to an additional downward acceleration that cannot be explained solely by gravity and ion drag. This acceleration can be attributed to a positive charging of the particle induced by extreme out-of-equilibrium conditions of the plasma sheath in its surroundings: locally the plasma sheath can be completely deprived of electrons by means of the bias. We observe similar particle behaviors also in the afterglow of the discharge for a persisting bias voltage on the electrode: damped oscillation into a new equilibrium or (accelerated) fall according to the bias. The observed particle dynamics in locally tailored plasma sheath environments directly monitors changes in electric field structures and plasma density profiles. EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011 Schubert G. Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Germany aut Basner R. Leibniz-Institute for Plasma Research and Technology (INP), Greifswald, Germany aut Kersten H. Institute for Experimental and Applied Physics, University of Kiel, Kiel, Germany aut Fehske H. Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Germany aut The European Physical Journal D Springer-Verlag 63/3(2011-08-01), 431-440 1434-6060 63:3<431 2011 63 10053 https://doi.org/10.1140/epjd/e2011-20077-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epjd/e2011-20077-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schubert G. Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Germany aut NATIONALLICENCE 700 1- Basner R. Leibniz-Institute for Plasma Research and Technology (INP), Greifswald, Germany aut NATIONALLICENCE 700 1- Kersten H. Institute for Experimental and Applied Physics, University of Kiel, Kiel, Germany aut NATIONALLICENCE 700 1- Fehske H. Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Germany aut NATIONALLICENCE 773 0- The European Physical Journal D Springer-Verlag 63/3(2011-08-01), 431-440 1434-6060 63:3<431 2011 63 10053 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer