Перегляд за Автор "Martins, Sofia"

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Electron drift velocity in NH3 in strong electric fields determined from rf breakdown curves
(JOURNAL OF PHYSICS D: APPLIED PHYSICS, 2005-03) Lisovskiy, Valeriy; Martins, Sofia; Landry, Karine; Douai, David; Booth, Jean-Paul; Cassagne, Valerick
We report measurements of the breakdown curves of a radio-frequency capacitive discharge in low pressure ammonia. The electron drift velocity was determined from the location of turning points in the breakdown curves in the range of E/p = 42–713 Vcm−1 Torr−1. We compare our results to values calculated from the published cross-sections in the range E/p = 1–5000 Vcm−1 Torr−1 and find good agreement.
Extinction of RF capacitive low-pressure discharges
(EUROPHYSICS LETTERS, 2005-08) Lisovskiy, Valeriy; Booth, Jean-Paul; Martins, Sofia; Landry, Karine; Douai, David; Cassagne, Valerick
Breakdown and extinction curves have been measured for RF capacitive low-pressure discharges in nitrogen and hydrogen at a frequency of 13.56 MHz and discharge gaps between 6 and 25 mm. In particular, the low-pressure, high-voltage region of the extinction curves is reported for the first time. The shape of the extinction curves was found to be similar to that of the breakdown curves. At sufficiently large gaps (L > 10 mm) the RF extinction voltage was found to be multi-valued in the low-pressure region, as is observed for the breakdown voltage. In this region, extinction can occur when the voltage is increased because the width of the two sheaths occupies the whole discharge space.