Observation of Ω mode electron heating in dusty argon radio frequency discharges

The time-resolved emission of argon atoms in a dusty plasma has been measured with phase-resolved optical emission spectroscopy using an intensified charge-coupled device camera. For that purpose, three-dimensional dust clouds have been confined in a capacitively coupled rf argon discharge with the...

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Veröffentlicht in:Physics of plasmas 2013-08, Vol.20 (8)
Hauptverfasser: Killer, Carsten, Bandelow, Gunnar, Matyash, Konstantin, Schneider, Ralf, Melzer, André
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creator Killer, Carsten
Bandelow, Gunnar
Matyash, Konstantin
Schneider, Ralf
Melzer, André
description The time-resolved emission of argon atoms in a dusty plasma has been measured with phase-resolved optical emission spectroscopy using an intensified charge-coupled device camera. For that purpose, three-dimensional dust clouds have been confined in a capacitively coupled rf argon discharge with the help of thermophoretic levitation. While electrons are exclusively heated by the expanding sheath (α mode) in the dust-free case, electron heating takes place in the entire plasma bulk when the discharge volume is filled with dust particles. Such a behavior is known as Ω mode, first observed in electronegative plasmas. Furthermore, particle-in-cell simulations have been carried out, which reproduce the trends of the experimental findings. These simulations support previous numerical models showing that the enhanced atomic emission in the plasma can be attributed to a bulk electric field, which is mainly caused by the reduced electrical conductivity due to electron depletion.
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source AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection
subjects ARGON
ATOMS
CAMERAS
CHARGE-COUPLED DEVICES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DUSTS
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRONS
EMISSION SPECTROSCOPY
HEATING
HIGH-FREQUENCY DISCHARGES
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
NUMERICAL ANALYSIS
PLASMA DIAGNOSTICS
PLASMA SHEATH
PLASMA SIMULATION
RADIOWAVE RADIATION
SENSORS
TIME RESOLUTION
title Observation of Ω mode electron heating in dusty argon radio frequency discharges
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