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(a) Frequency dependence of the ratio of electron-dissipated power density (Je · E/Jtot · E where Je , Jtot, and E represent the electron current, the total current, and the electric field, respectively) and the breakdown voltage in the 200 μm gap. (b)–(g) Time-resolved normalized and (h) time-averaged spatial profiles of the electron-dissipated power density for various frequencies. (b) γ mode and (c) α-γ mode transition. (d)–(g) α mode.
Non-monotonic evolution of the (a) time-averaged and (b) time-resolved normalized EEDFs with driving frequency at the left-hand side electrode during one rf cycle. (c) The relative portion of energetic electrons striking the electrode for various frequencies.
(a) Evolution of EEPFs with driving frequency at the discharge center. (b) Non-monotonic evolution of effective electron temperature and electron density at the discharge center for various frequencies. The effective electron temperature is calculated as Teff = 2 < ɛ > /3.
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