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Calculated time and spatially averaged densities of the important charged particles in an atmospheric DBD in helium with different levels of impurity. The vertical dotted line indicates the boundary between the governed part and the governed part. The upper dotted curve indicates the sum of the positive ion densities.
Calculated time and spatially averaged densities of the important charged particles in an atmospheric pressure helium DBD with nitrogen impurity levels ranging from to 0.5%. Region I denotes the governed part, region II the governed part, region III the governed part with significant contribution, and region IV is completely governed by ions.
Calculated sums of total production and destruction rates for , , and .
Reactions included in the model with their reaction coefficients. The first three reaction coefficients are calculated using BOLSIG. In reaction 16, denotes a heavy collision partner and the destruction frequency is taken from Golubovskii et al. 11
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