Radial theory of the ion current onto a probe in a low-pressure plasma with allowance for volume ionization and collisions with neutrals

Complete parametrization of the plasma-sheath transition andI–Vcurves for a cylindrical or spherical Langmuir probe according to the features of the probe, simultaneously including geometry, ionization and collisions

“…Recently, several papers that consider the effect of the collisions in the framework of the orbital-motion-limited (OML) have being published [7][8][9][10] On the other hand, they are the radial theories which consider the motion of the positive ions as a fluid which, dragged by the electric field, radially falls towards the probe. These theories are suitable when the temperature of the positive ions is negligible compared to the electron temperature [4,5,[11][12][13][14][15][16][17][18] and are normally known as Allen-Boyd-Reynolds (ABR) models. In recent years, the study of the interaction of the plasma with a spherical body has also become a point of interest due to its application to dusty plasmas and the study of crystal plasmas [19][20][21][22].…”