Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Poster Tuesday: Scanning Probe Techniques

O 47.12: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Three dimensional tracing of the trajectory of a charged particle by electrostatic detection — •Erdem Genc, Doris Tarasevitch, Tobias Roos, Detlef Utzat, Hermann Nienhaus, and Rolf Möller — Fakultät für Physik/Cenide, Universität Duisburg-Essen, Germany

The position of a moving charged particle in free space is determined by using a configuration of electrodes in a parallel plate capacitor geometry. The electrodes are connected to ultra-sensitive and fast charge amplifiers [1] which measure the time-dependent displaced charge in the electrodes. In the experiment we trace the trajectory of a steel sphere of 1mm in diameter which falls freely and bounces off a surface. The initial charge on the sphere is 0.1pC. A spatial resolution of approximately 0.1mm perpendicular and 1mm parallel to the electrodes is achieved combined with a temporal resolution of better than 10 microseconds. In addition, the transfer of electric charge between the sphere and the electrodes during contact is evalutated for every collision. The experimental results are in excellent agreement with calculations applying classical electrodynamics. The method allows the access to charge transfer processes between colliding particles which is of high relevance in technology and fundamental research. [1] P. Graf. et al., Rev. Sci. Instrum. 88, 084702 (2017).

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