Electron avalanches and diffused {gamma}-mode in radio-frequency capacitively coupled atmospheric-pressure microplasmas
- Department of Electronic and Electrical Engineering, Loughborough University, Leicestershire LE11 3TU (United Kingdom)
Space-, time- and wavelength-resolved optical emission profiles suggest that the helium emission at 706 nm can be used to indicate the presence of high energy electrons and estimate the sheath in helium rf discharges containing small concentration of air impurities. Furthermore, the experimental data supports the theoretical predictions of energetic electron avalanches transiting across the discharge gap in rf microdischarges and the absence of an {alpha}-mode. Nonetheless, microdischarges sustained between bare metal electrodes and operating in the {gamma}-mode can produce diffuse glowlike discharges rather than the typical radially constricted plasmas observed in millimeter-size rf atmospheric-pressure {gamma} discharges.
- OSTI ID:
- 21294192
- Journal Information:
- Applied Physics Letters, Vol. 95, Issue 3; Other Information: DOI: 10.1063/1.3186073; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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