Volume 120, Number 2, October 2017
|Number of page(s)||5|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||08 January 2018|
Field-emission enhanced breakdown in oxygen microdischarges from direct-current to radio-frequencies
1 Department of Experimental Physics, Comenius University - Mlynska dolina F2, 84248 Bratislava, Slovakia
2 Institute of Physics, University of Belgrade - Pregrevica 118, 11080 Zemun, Serbia
Received: 8 September 2017
Accepted: 19 December 2017
This paper reports on experimental studies of the breakdown mechanism in oxygen microdischarges generated in static and time-varying electric fields, up to radio-frequencies. Measurements were performed by using electrodes with round edges separated by a distance ranging between and , with the gas pressure from 7.5 Torr to 700 Torr. It is shown that the breakdown voltage does not obey standard scaling law for gaps of the order of a few microns for both direct current and alternating fields. A high electric field obtained in small gaps may enhance the secondary electron emission leading to the lowering of the breakdown voltage and departure from the standard scaling law. With increasing the gap size, the breakdown voltage increases since the contribution of field emission progressively reduces. Based on the breakdown voltage curves, the yields corresponding to the secondary electron production have been estimated. The threshold for field emission determined from our experimental data agree well with the value from the literature.
PACS: 52.90.+z – Other topics in physics of plasmas and electric discharges (restricted to new topics in section 52) / 52.80.Tn – Other gas discharges / 52.80.-s – Electric discharges
© EPLA, 2018
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