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The following paper includes a physical microscopic particle-description ofthe phenomena and mechanisms that lead to the extraction of ions with the aimto generate thrust. This theoretical treatise arose from the intention tovisualize the behavior of the involved particles under effect of the involvedelectrical fields. By this way, an underlying basis for experimentalinvestigations of the work of an ion thruster should be formed. So a foundationwas created, which explains the ion extracting and so thrust generatingfunction of an ion thruster. The theoretical work was related to theRadio-frequency Ion Thruster (RIT). But the model worked out can be generalizedfor all thruster types that use electrostatic fields to extract positivelycharged ions.

On the microscopic mechanism of ion-extraction of a gridded ion propulsion thruster