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(a) Electric potential across the plasma, averaged over . The inset is a zoom on the same potential and shows the presheath. (b) Positive (solid line) and negative (dashed line) ion densities as a function of position, averaged over . The vertical dotted lines in (a) and (b) show the anodic sheath-presheath boundary .
Average velocity (absolute value) of the positive (solid line) and negative (dashed line) ions as a function of position corresponding to Fig. 1(a). The two horizontal dotted lines represent the Bohm velocity and the average velocity along one direction of a thermal distribution, while the vertical dotted line shows the anodic sheath edge .
Sheath width as a function of . The black circles (●) are sheath widths from the simulation and the dashed line is the corresponding linear fit, while the dotted and the dotted-dashed lines are the sheath widths predicted by the theory assuming a Bohm velocity and a thermal velocity, respectively. The inset shows the electric potential across the plasma for various dc biases . Note that for clarity, the potential profiles in the inset were plotted with the right electrode shifted to the same potential reference.
Electric potential across the plasma, averaged over for various negative to positive ion mass ratios; the solid, dashed, dotted-dashed, and dotted lines are for equal to 1, 0.99, 0.95, and 0.9, respectively.
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