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- W2003669236 abstract "By using a rf compensated Langmuir probe and optical emission spectroscopy, the effects of driving frequency (13.56–50 MHz) on the electron energy probability function (EEPF), electron density, electron temperature, and the vibrational and rotational temperatures in capacitively coupled nitrogen discharge were investigated. Measurements were performed in the pressure range 60–200 mTorr, and at a fixed voltage of 140 V (peak-to-peak). With increasing the driving frequency, the dissipated power and electron density markedly increased along with the intensity of the optical emission lines belonging to the 2nd positive (337.1 nm) and 1st negative systems (391.4 nm) of N2. The EEPF at low pressure 60 mTorr is two-temperature (bi-Maxwellian) distribution, irrespective of the driving frequency, in contrast with argon and helium discharges in the similar conditions. The mechanism forming such bi-Maxwellian shape was explained by two combined effects: one is the collisionless sheath-heating effect enhancing the tail electron population, and the other is the collision-induced reduction of electrons at the energy 2–4 eV where the collision cross-section for the vibrational excitation has a resonantly large peak. The two-temperature EEPF structure was basically retained at moderate pressure 120 mTorr and high pressure 200 mTorr. The vibrational temperature Tvib and rotational temperature Trot are measured for the sequence (Δν=−2) of N2 second positive system (C3Πu→B3Πg) using the method of comparing the measured and calculated spectra with a chi-squared minimization procedure. It was found that, both of Tvib and Trot are a weakly dependent on driving frequency at low pressure 60 mTorr. At higher pressure (120 and 200 mTorr), Tvib rises monotonically with the driving frequency, whereas the Trot slightly decreases with frequency below 37 MHz, beyond which it relatively increases or saturated." @default.
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- W2003669236 date "2012-11-01" @default.
- W2003669236 modified "2023-10-18" @default.
- W2003669236 title "Electron energy distribution functions measured by Langmuir probe with optical emission spectroscopy in very high frequency capacitive discharge in nitrogen" @default.
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- W2003669236 doi "https://doi.org/10.1063/1.4766475" @default.
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