Discharge comparison of nonequilibrium atmospheric pressure Ar/O[sub 2] and He/O[sub 2] plasma jets

Wang, S.; Gathen, V. Schulz-von der; Döbele, H. F.
October 2003
Applied Physics Letters;10/20/2003, Vol. 83 Issue 16, p3272
Academic Journal
A plasma jet has been developed that operates using rf power and produces a stable homogeneous discharge at atmospheric pressure. Discharge characteristics for the gas mixture of He/O[sub 2] and Ar/O[sub 2] were studied. The temperature distribution at the exit of the nozzle of Ar/O[sub 2] discharge is about 100 K higher than that for the He/O[sub 2] discharge—identified by an increased temperature—extends much farther downstream for Ar/O[sub 2] discharge in contrast to the He/O[sub 2] discharge—250 mm as compared to 75 mm. Optical emission spectra for both discharges in the jet effluent shows only fractions of the peak intensities of Ar, He, and O atomic lines compared with spectra taken looking obliquely inside the jet volume. The spatial profile of excited atomic oxygen at λ=777 nm ([sup 4]S[sub 0] 3p–3s) taken side on to the flow direction outside the nozzle shows good correlation to the temperature distribution for both discharges. These results indicate that the Ar/O[sub 2] discharge has better energy transfer efficiency than the He/O[sub 2] discharge. Study of the electrical properties of the two discharges shows that the two discharges exhibit a different capacitive nature and the voltage wave form for He/O[sub 2] advances that of the Ar/O[sub 2] discharge by 16°, which means there is more ohmic component in the Ar/O[sub 2] discharge. © 2003 American Institute of Physics.


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