Upper bound to the pressure in an elementary vacuum system

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Abstract
A vacuum system consisting of a volume V, a pump with speed S, and a surface area A on which there are initially adsorbed n (0) molecules in a first-order desorption state is considered and discussed. The essential result is that Pmax=1.146×10−5 A/St Torr is expected to provide a reasonably accurate estimate for the value the pressure should be strictly less than t seconds after the pumping has started, given that the pressure in the system is due to an adsorbed surface phase. Experimental tests of this relation have been performed and comparisons are made between this result and the pressure measured in an elementary vacuum system.

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