Abstract
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.
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