| Issue |
EPL
Volume 105, Number 2, January 2014
|
|
|---|---|---|
| Article Number | 25001 | |
| Number of page(s) | 4 | |
| Section | Physics of Gases, Plasmas and Electric Discharges | |
| DOI | https://doi.org/10.1209/0295-5075/105/25001 | |
| Published online | 06 February 2014 | |
Time-resolved ion density determination by electrical current measurements in an atmospheric-pressure argon plasma
Leibniz Institute for Plasma Science and Technology (INP Greifswald) - Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
Received: 7 November 2013
Accepted: 13 January 2014
High-resolution current signal measurements of a self-pulsing transient spark discharge revealed oscillations in the pulse decay phase. These oscillations appear with decreasing frequency between 250 MHz and 50 MHz for a specific gas flow range. The frequencies are well within the range of the plasma ion frequency. Consequently, ion acoustic waves are discussed as a possible reason. Considering molecular argon ions as the dominant ion, densities are found to decrease from 
to 
. Evaluation of the plasma ion frequency creates a new possibility to determine ion densities.
PACS: 52.35.Fp – Electrostatic waves and oscillations (e.g., ion-acoustic waves) / 52.25.-b – Plasma properties / 52.70.-m – Plasma diagnostic techniques and instrumentation
© EPLA, 2014
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