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• W2019946529 abstract "Abstract The present work describes the apparatus and techniques used at the S.A.E.S. Research Laboratories to study the gettering action of evaporated barium films on different gases. During the past few years the sorption of gases by getters (evaporated or not) has been increasingly studied from a kinetic approach, by techniques capable of giving a direct measurement of the velocity of sorption. Kinetic measurements can be effected either by measuring the fall of pressure with time in a sealed container of known volume, or by estimating the gas flow through a capillary of known conductance. The latter method can be applied by keeping the manifold pressure constant and allowing the getter pressure to vary with time, but more useful results can be obtained when the pressure on the getter is kept constant. Measurements at constant p m are by us usually confined to preliminary large scale investigations. For such measurements suitable apparatus and automatic pressure recordings are used, which enable us to carry out more than one test at the same time. For sorption studies at very low pressures, the normal apparatus is attached to an ultra high vacuum system. The experimental results obtained by measuring the gas flow at constant p g , when suitably interpreted, allow us to study the complex sorption mechanism, showing the existence of diffusion phenomena, giving useful indications about the mobility of molecules on the surface and within the film and permitting the evaluation of the activation energy of different processes. Suitable apparatus enables us to study the influence of hot filaments and ionizing electron currents in the vicinity of the getter. A knowledge of these effects is in fact necessary for a correct evaluation of the data obtained for sorption velocities by using ionization gauges and permits these effects to be kept at a minimum in the experimental procedure. Further suitable apparatus is employed to study other parameters which may effect the activity of barium getters, such as the time of flashing, the pressure immediately preceding the firing of the getter, the distance and temperature of the surface on which the film is formed. In particular such devices permit the study, by electron microscopy, of the structure of the barium films obtained under various conditions. Finally, the recent introduction of mass spectrometers of reduced dimensions and able to measure very low partial pressures (e.g. the omegatron), enable us to confirm the eventual chemical processes occurring on the barium film (catalytic reactions) and also it opens a way to the study of getter action on gaseous mixtures." @default.
• W2019946529 created "2016-06-24" @default.
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• W2019946529 date "1960-02-01" @default.
• W2019946529 modified "2023-09-27" @default.
• W2019946529 title "Apparatus and techniques for measurements of the adsorption of gases by evaporated getters" @default.
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• W2019946529 doi "https://doi.org/10.1016/0042-207x(60)90132-9" @default.
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