Abstract
The ion current to the forward stagnation region of a highly negative probe is analyzed by using the boundary-layer approximation. The ratio of the sheath thickness to the boundary-layer thickness is assumed in the range from a few tenths to 1. The effects of various parameters on the ion current are made clear. The dimensionless current-voltage characteristic which depends on the velocity profile, the ambipolar Schmidt number and the Prandtl number has been introduced. This relation is avbailable to calculate the ion number density from the measured current and applied probe potential. Numerical examples are shown for typical cases. It is shown that the ion current increases with the absolute value of the probe potential and a constant saturation current cannot be obtained.
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