Berlin 2014 – scientific programme

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P: Fachverband Plasmaphysik

P 23: Low Temperature Plasmas II

P 23.7: Talk

Thursday, March 20, 2014, 15:45–16:00, SPA HS201

Observation of ion acoustic waves by electrical current measurements in a self pulsing plasma at atmospheric pressure in argon — •Torsten Gerling, René Bussiahn, Christian Wilke, and Klaus-Dieter Weltmann — INP Greifswald

High resolution current signals of a self-pulsing discharge revealed characteristic oscillations in the pulse decay phase. These oscillations appear with decreasing frequency between 250 MHz and 75 MHz. The frequency values are well within the range of the plasma ion frequency, indicating the presence of ion acoustic waves. Conditions for the creation of these oscillations as well as first evaluated ion densities will be presented. The results give Ar₂⁺ densities from 5 · 10¹² cm⁻³ up to 10¹⁴ cm⁻³.