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Download Vacuum Technology Transactions. Proceedings of the Sixth by C. Robert Meissner PDF

By C. Robert Meissner

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Extra resources for Vacuum Technology Transactions. Proceedings of the Sixth National Symposium

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The measurement of such equilibrium pressures by means of a mass spectrometer is very complicated, because there is always a dynamic equilibrium between the gas evolution rate from the measuring system and the gettering rate. Getter metals such as Ti, Zr and Tashow an equilibrium of solution with hydrogen, depending on temperature and pressure. If very low pressures have to be reached only a very small amount of hydrogen may have been taken up by the getter. Especially when the getter is subjected to large changes in the temperature, as it is the case during the operation of electronic tubes, the partial pressure of hydrogen will vary also.

1. A similar experiment with nitrogen and carbon monoxide proved that the adsorption was not measurable at the given state of degassing of the vacuum system. During the influx of water, hydrogen was evolved. 700cm z VOL. 0,51 / 10° 10' 10" 103 H20 PRESSURE. Torr FIG. 1. Adsorption of water vapour in a vacuum system of glass. The evolution increased continuously with the amount of water let-in. This H 2 evolution is only in part caused by the reaction between H 2 0 and the oxide cathode. A comparison SCHMIDT taps, only 1 per cent of the water which had been let in could be found after a waiting time of 70 hr.

The gases listed were applied to film A at the same time; film B was saturated step by step with CO. The measurement of such equilibrium pressures by means of a mass spectrometer is very complicated, because there is always a dynamic equilibrium between the gas evolution rate from the measuring system and the gettering rate. Getter metals such as Ti, Zr and Tashow an equilibrium of solution with hydrogen, depending on temperature and pressure. If very low pressures have to be reached only a very small amount of hydrogen may have been taken up by the getter.

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