Sheath structure in plasma with two species of positive ions and secondary electrons

Zhao Xiao-Yun^{1, 2, 3, 4}, Xiang Nong^{1, 4, †,}, Ou Jing^{1, 4}, Li De-Hui^{1, 4}, Lin Bin-Bin^{1, 4}

Variations of wall potential φ_w with (a) ion mass ratio m₂/m₁ for different values of N₂₀, and (b) with the relative concentration of two ion species N₂₀ for different values of Z₂ and γ.