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A parallel plate discharge, operated in argon in the pressure range p = 0.001 to 1 mbar, was investigated with a special interest on the mechanism of power deposition and on the electron energy distribution function (EEOF). Various diagnostic methods were used in combination in order to obtain a sufficient characterization of the discharge. The predominant channel of power flux was found to change with increasing pressure from Joule-type heating in the plasma bulk to heating by beam-like secondary electrons emitted by the powered electrode. Measured EEOFS differ from Maxwellians and change their shape along the discharge axis.

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