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چکیده
Although early texts state that 2 “the mechanism of the positive column is fairly well understood”, Chapman warns us 4 that, “We should heed the warning of Cobine (1958) ......., that no sources are infallible, that all proofs should be questioned, and that no discharge phenomena are so well understood that data can be applied precisely.” On the face of it, the Ip-VC curve in our experiments is unremarkable in that it is similar to any other probe characteristic curve measured for a GD plasma. However there are a significant number of indicators which demonstrate that both the downstream FAG and FD plasmas cannot be the free ion-electron medium usually assumed. Because this goes very much against the received wisdom, it is incumbent upon us to consider, in some detail, why classical „free ion-electron plasma‟ theory does not appear to work in this case.
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