Characterization of atmospheric-pressure ac micro-discharge in He-N-2 mixture using time- and space-resolved optical emission spectroscopy

Ramasamy Pothiraja, Cornelia Ruhrmann, Max Engelhardt, Nikita Bibinov, Peter Awakowicz

JOURNAL OF PHYSICS D-APPLIED PHYSICS, Volume: 46, Issue: 46, Special Issue: SI, Article Number: UNSP 464012, DOI: 10.1088/0022-3727/46/46/464012, Published: NOV 20 2013


An ac discharge is ignited with the frequency of 170 kHz at the tip of a sharpened electrode in He-N-2 gas mixture under atmospheric pressure. Plasma parameters ( electron density and reduced electric field) are determined using phase-resolved optical emission spectroscopy. An absolutely calibrated ICCD camera with an appropriate filter is used for the time- and space-resolved measurement of N-2(C-B, 0-2) as well as N-2(+) (B-X, 0-0) emissions. From the temporal and spatial distributions of these emission bands, time-and space-resolved plasma parameters are determined. Limits of time and space resolutions of this diagnostic method are discussed.

Tags: plasma