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 critical value of SEE coefficient with relative concentration between two ion species for different (a) ion species at Z₂ = 1 and (b) charge number Z₂ = 2 (Ar²⁺) and 3 (Ar³⁺).