Abstract
This paper deals with the determination of electron density in a pulsed surface wave discharge (frequency ω/2π=1.1 GHz, pulse duration τ∼10 μs), in an air-like mixture at about 10 Torr in a capillary tube (inside diameter 1.5 mm). A time-resolved diagnostic based on microwave interferometry is developed. It is shown that it provides both the collision frequency ν and the electron density ne except when ν/ω exceeds a certain value (5 for these operating parameters).
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