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- W2806913050 abstract "Abstract Determining the electron properties of weakly ionized gases, particularly in a high electron-neutral collisional condition, is a nontrivial task; thus, the mechanisms underlying the electron characteristics and electron heating structure in radio-frequency (rf) collisional discharges remain unclear. Here, we report the electrical characteristics and electron information in single-frequency (4.52 MHz and 13.56 MHz) and dual-frequency (a combination of 4.52 MHz and 13.56 MHz) capacitive discharges within the abnormal α-mode regime at atmospheric pressure. A continuum radiation-based electron diagnostic method is employed to estimate the electron density ( n e ) and temperature ( T e ). Our experimental observations reveal that time-averaged n e (7.7–14 × 10 11 cm −3 ) and T e (1.75–2.5 eV) can be independently controlled in dual-frequency discharge, whereas such control is nontrivial in single-frequency discharge, which shows a linear increase in n e and little to no change in T e with increases in the rf input power. Furthermore, the two-dimensional spatiotemporal evolution of neutral bremsstrahlung and associated electron heating structures is demonstrated. These results reveal that a symmetric structure in electron heating becomes asymmetric (via a local suppression of electron temperature) as two-frequency power is simultaneously introduced." @default.
- W2806913050 created "2018-06-13" @default.
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- W2806913050 date "2018-05-14" @default.
- W2806913050 modified "2023-10-12" @default.
- W2806913050 title "Electron Information in Single- and Dual-Frequency Capacitive Discharges at Atmospheric Pressure" @default.
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- W2806913050 doi "https://doi.org/10.1038/s41598-018-25892-w" @default.
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