Cold cathode ionisation gauges for the measurement of low pressures

Static Volumetric Methods for Determination of Absorbed Amount of Gases on Clean Solid Surfaces

“…Diffusion of gases through certain solids (Table 8) can be used for slow admission of gases into the apparatus and their simultaneous cleaning. The admission of gas is usually effected by means of a tube made of a given solid and heated either by direct passing of electric current [142,194,195] or by an external heater. The latter is mostly made of Nichrome wire wound around the outside of a vessel surrounding the given tube [190] or, in c a s e of higher temperatures, fastened on wire (tungsten) catches or ceramics within the vessel in the immediate proximity of the tube [27,197,198].…”