We introduce a microhollow cathode configuration with venturi gas flow to ambient air in order to obtain glow discharge at atmospheric pressure. Stable microhollow cathode discharge was formed in a 200μm diameter at 9mA and the optimum value of gas velocity×diameter for hollow cathode effect was obtained in our system. In order to confirm hollow cathode effect, we measured the enhancement of E∕N strength for 200μm (0.31m2∕s) and 500μm (0.78m2∕s) air discharge at 8mA under the velocity of 156m∕s. As a result, an increase of 46.7% in E∕N strength of the discharge of 200μm hole was obtained compare to that of 500μm.
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Park et al. (2008) studied this question.
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