EFFECTS OF BOUNDARY-CONDITIONS IN THE DYNAMIC-MODEL OF THE RF SHEATH

The present paper is concerned with the effects of boundary conditions on the electrical sheath characteristics in the dynamic rf sheath mod el. The dynamic rf sheath model, which is described by a moving bounda ry problem, is solved analytically and numerically in the collisionles s case for arbitrary values of the electric field at the plasma-sheath interface. The results that are obtained show that even for relativel y high rf sheath voltages, the rf sheath capacitance and the dc sheath voltage are influenced in a significant way by the choice of the boun dary condition for the electric field.