Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4895630
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Funding
- DGA (Delegation Generale de l'Armement)
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Deviations from the Paschen's law in air and nitrogen are investigated for gaps from 100 nm to 10 mu m, by using a high precision electrode positioning system. The deviation is observed when electrode gaps are smaller than 4 mu m at atmospheric pressure. At distances lower than 1 mu m, a nearly constant average breakdown field of 350 V/mu m is evidenced in both gases with Au and Ru electrodes. A metallic plasma initiated by field emission from the cathode can explain the reduction of the breakdown voltage at such low gaps. In ambient air, the existence of a pre-breakdown current is also evidenced, probably due to the presence of water adsorbed on electrodes. (C) 2014 AIP Publishing LLC.
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