Abstract
A formula for the admittance of a spherical probe in a warm collisional homogeneous plasma is derived using a step ion sheath with complete electron reflection at the sheath‐plasma interface. The resulting equations for the perturbations in sheath voltage and number density at the interface are related to the resonance probe phenomenon. Laboratory measurements displayed the effect of sheath thickness on the resonance probe characteristic. The rigid boundary theory is experimentally shown to break down at sheath collapse, comparing a suitable absorptive boundary theory with the experiment.
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