Experimental I – V characteristics of dc microdischarges in helium at different operating pressures ( p = 300–800 Torr) reveal that the classical scaling law of the cathode layer (sheath) does not apply. It is shown that a modified semi-analytical model of the cathode layer that accounts for neutral gas heating is able to reproduce the trends of the experimental I – V characteristics. The model can also be used to quantify the influence of gas heating on microdischarge characteristics and to estimate conditions for stable operation of microdischarges.
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Belostotskiy et al. (2008) studied this question.
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