Schematic of electric circuit used to generate the microplasmas and for stability analysis.
The rms voltage-current characteristic for dc microplasma glow discharge is atmospheric pressure hydrogen showing transition from unstable∕oscillating to stable modes and corresponding change in the appearance of the discharge (insets). For the discharge images shown, the anode is a wire at the top of the image and the cathode is a plate at the bottom.
Current wave form during unstable operation of a dc glow discharge in atmospheric pressure air. The inset shows higher temporal resolution measurement.
Images of atmospheric pressure microplasmas in helium (a) stable with only nominal parasitic capacitance and (b) unstable with capacitor in parallel with discharge. The rms current was for both discharges.
Micrographs of deposited amorphous carbon from atmospheric pressure mixture in case of (a) unstabilized and (b) external circuit stabilized microplasmas. Magnification in both images is the same.
Discharge parameters, estimations of instability growth rates, and related parameters for a , discharge gap in various gases.
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