The time dependence of the spectral emission of an atmospheric pressure glow discharge in helium with impurities has been studied with a two-dimensional spatial resolution. Emissions from HeI(3s3S→2p3P:λ=706.5nm) and N2(C3Πu→B3Πg:λ=337.1nm) are used to qualitatively map the distributions of high- and low-energy electrons, respectively. The emission from N2+(B2∑u+→X2∑g+:λ=391.4nm) provides qualitative information about the relative spatial distribution of He* metastable atoms within the discharge gap. The results demonstrate a radial spreading of the discharge during the current pulse as well as the formation of a ringlike, radially propagating cathode layer late in the current pulse.
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Anderson et al. (2004) studied this question.
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