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- W2022892725 endingPage "065046" @default.
- W2022892725 startingPage "065046" @default.
- W2022892725 abstract "Time-resolved electron density, ne, is measured in a low pressure pulsed two-frequency capacitively coupled plasma discharge sustained in Ar and in Ar/CF4/O2 (80 : 10 : 10) gas mixture using a floating resonance hairpin probe. The top electrode is powered by 60 MHz in pulse mode and the bottom electrode is powered by 2 MHz in continuous wave mode. The dependence of time-resolved ne on the low frequency (LF) and high frequency (HF) power levels, operating gas pressure, pulse repetition frequency (PRF) and duty cycle are investigated. It is found that the steady state ne in the long on-phase is greatly influenced by the HF power level and slightly affected by the LF power level in both Ar and Ar/CF4/O2 plasma. The decay time of ne is slow (∼30–90 µs) in the case of Ar plasma and strongly depends on the LF power level, whereas in the case of Ar/CF4/O2 gas mixture it is very fast (∼15 µs) and marginally dependent on LF power level. In Ar plasma the steady state ne is increasing with a rise in operating gas pressure, however, in Ar/CF4/O2 plasma it first increases with gas pressure reaching to the maximum (at 20 mTorr) value and then decreases. The pressure dependence of decay time constant mimics the pressure variation of steady state ne. Furthermore, it is observed that the on-phase electron density is greatly affected by changing the PRF and duty cycle. This effect is more prominent in Ar/CF4/O2 plasma when compared to Ar discharge. In addition, ne is observed to overshoot the steady state densities in the beginning of the on-phase in Ar/CF4/O2 gas mixture, but this effect is either small or absent in the case of Ar plasma." @default.
- W2022892725 created "2016-06-24" @default.
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- W2022892725 date "2014-11-11" @default.
- W2022892725 modified "2023-09-27" @default.
- W2022892725 title "Temporal evolution of electron density in a low pressure pulsed two-frequency (60 MHz/2 MHz) capacitively coupled plasma discharge" @default.
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- W2022892725 doi "https://doi.org/10.1088/0963-0252/23/6/065046" @default.
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