In situ FTIR diagnostics of the radio-frequency plasma decomposition of N2O |
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Authors: | T. A. Cleland D. W. Hess |
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Affiliation: | (1) Department of Chemical Engineering, University of California, 94720 Berkeley, California |
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Abstract: | The decomposition of N2O in a 13.56-MHz parallel-plate system was studied usingin situ Fourier transform infrared (FTIR) spectroscopy. Areas of two infrared absorption bands of N2O recorded at 8 cm–1 resolution were used to estimate relative gas-phase dissociation as a function of rf power and flow rate at 500 mT. Flow rate was found to strongly affect band areas over the range of powers investigated (10–90 W). The effect of rf power on band areas diminished above 40 W, probably due to poor plasma confinement. Distortion of the band shapes by the plasma permitted rotational temperatures to be estimated. Rotational temperature increased essentially linearly with power at constant flow rate, reaching 450 K at 80 W, but was independent of flow rate at constant power. Rotational temperatures were also found to depend on the temperature of the electrodes, which were heated by plasma exposure. No infrared-active product species were observed even under batch conditions where all N2O was irreversibly dissociated. This lack of detectable products and a 50% pressure rise observed in a batch study suggest that N2 and O2 are the primary stable discharge products. |
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Keywords: | Radio-frequency (rf) discharge gas-phase dissociation nitrous oxide infrared spectroscopy Fourier transform infrared (FTIR) spectroscopy rotational temperature plasma diagnostics |
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