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The measured ion density ratio of to and electron temperature in Region II as a function of grid bias voltage .
The measured plasma parameters in Region II as a function of the grid bias voltage: (a) electron density (b) plasma potential in Region II , (c) potential difference between the Regions I and II , and (d) sheath length around grid wires as a function of .
The ion production ratio of the ion flux diffusing from Region I to the ionization rate in Region II as function of in Regime 2.
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