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Mode transition in radio-frequency atmospheric argon discharges with and without dielectric barriers

2007; American Institute of Physics; Volume: 90; Issue: 10 Linguagem: Inglês

10.1063/1.2711413

1520-8842

Jianjun Shi, Michael G. Kong,

Electrohydrodynamics and Fluid Dynamics

In this letter, basic characteristics of glow modes and their mode transition are studied for radio-frequency (rf) atmospheric argon discharges with bare and dielectrically insulated electrodes. Through input power control, large-volume rf atmospheric argon discharges with bare electrodes are achieved in the α mode via an abrupt transition from a constricted γ mode, whereas dielectrically insulated electrodes result in large argon discharges in both the α and γ modes with gradual mode transition. Current dependence of the 750nm line intensity and of the gas temperature are shown to capture clearly the signature of mode transition.