Abstract
We investigate the sheath structure of an electronegative plasma atsteady state with the assumptions of cold positive ions and hot negativeions. The modified Bohm criterion is obtained with the Sagdeev potentialby introducing a modified ion sound velocity. At the same time theelectric potential, net space charge and particles densities in thesheath are analysed in several cases of different temperature ratios ofelectrons to negative ions and different density ratios of negative ionsto positive ions.
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