Abstract
In this work the densities of active species in an atmospheric pressure N2 dielectric barrier discharge (DBD) flowing afterglow are experimentally investigated. The main objective of this work is to propose a rather simple method for the estimation of the densities of these species via analytical calculations and optical emission spectroscopy results. The method described here could be of significant practical importance, for example in the optimization of surface treatment processes. Based on this method, under the conditions investigated here, it has been found that (i) densities of UV-emitting radiative states are below 3 × 108 cm−3, (ii) free radical densities of ∼2 × 1015 cm−3 and ∼1011 cm−3 are found, respectively, for atomic nitrogen and atomic oxygen, (iii) for the N2(X, v > 4) and N2(A) long-living particles the densities are, respectively, of the order of 1015 cm−3 and 1013 cm−3.
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