Abstract
The discharge mechanism occurring under UHV conditions is examined with special reference to T 31 , the time required for the discharge to develop to an extent such that measurable pumping action is observed. This paper supplements a previous paper in three aspects. First, the rate of growth of the electron cloud is calculated using the more appropriate exponential growth theory rather than the previously used chain reaction theory. Second, the range of experimental measurements have been extended to show that the previously deduced relation of pressure and starting time, PT s =constant, is valid for the range of 10 −8 to 10 −11 torr. Third, the experimentally observed dependence of starting time on the applied electric field is shown to be consistent with field emission as the primary mechanism for provision of the initial electron for the avalanche.
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