Abstract

The paper describes the use of active charcoal and a 13X molecular sieve at 78°K to pump all-glass apparatuses with a small volume (up to 5000 cm3) from atmospheric pressure to a pressure region of 10−2 mm Hg. At this pressure an outgassed second pumping stage (also sorbent) permits pressures from 10−6 to 10−7 mm Hg to be obtained. Active charcoal was also used as a two-stage fore pump (p=10−6 mm Hg) for a one-stage mercury diffusion pump and in this system pressures of 5 to 10×10−10 mm Hg were achieved.

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