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Current-voltage characteristics of rf APGD at 20, 40, and 60 MHz. Normalized iCCD images highlight plasma structure just before the APGD becomes unstable.
Frequency dependence of the peak dissipated rf power density and the helium emission intensity at 706.5 nm.
Frequency dependence of the current density and the electron density at a constant input power of .
Frequency dependence of the excited electron temperature and the argon line ratio at 434.8 and 750.4 nm at a constant power density of .
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