Spatio-temporally Resolved Investigation of Surface Charges, N-2(A(3)Sigma(+)(u)) Metastables and Discharge Development in Barrier Discharges

作者：Bogaczyk Marc; Nemschokmichal Sebastian; Zagoskin Anton; Sretenovic Goran B; Meichsner Juergen; Wagner Hans Erich^*

来源：Journal of Advanced Oxidation Technologies, 2012, 15(2): 310-320.

To study the interaction of an insulated surface with the volume of a barrier discharge, a discharge cell was developed to combine for the first time three diagnostic techniques in ONE discharge cell configuration. The discharge development was investigated by the cross-correlation-spectroscopy (CCS), the surface charge measurement on the dielectrics by the application of the optoelectronic Pockels effect in combination with a CCD camera, and the determination of the metastable. N-2(A(3)Sigma(+)(u)) molecule by laser induced fluorescence spectroscopy. Under the conditions studied, in pure N-2 and He the discharge usually operates in the diffuse Townsend-like mode. At over voltages in nitrogen as well as at small admixtures of N-2 (in percent range) to He the filamentary mode appears. The time dependent surface charge density in the helium diffuse mode of about |sigma| similar to 0.5 nC/cm(2) is in good agreement with the time integrated current pulses. The measurements in the filamentary mode show remaining charges from the previous half-cycle as well as a memory effect for the microdischarge ignition. The detection of the nitrogen metastables was performed in the filamentary mode, resulting in a density of about 10(13) cm(-3). The maximal density is reached clearly after the microdischarge and a difference between the anode and cathode phase is obvious.

• 出版日期2012-7