Time-resolved probe measurements in transient gas discharges

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Abstract
A circuit to perform time-resolved Langmuir probe measurements in low-pressure gas discharges is described. The condition to be fulfilled is that the plasma variations must be repetitive with a constant frequency of at least about 100 Hz. The second derivative is approximated by the second differences of the successive measuring points of the current-voltage probe characteristic. These second differences are obtained directly with a time resolution of 1 mu s.