Electron heating in inductively coupled discharges

An analytic expression for the surface impedance for electron heating in inductively coupled discharges is derived from the kinetic equation with the optimum ordering that ν∼ω. Here, ν is the electron collision frequency, and ω is the frequency of the driven current inside the antenna coil. The expression is valid for both collisional and collisionless discharges, and can be employed in the modeling of the source.