Abstract
An investigation has been made to determine whether the rate of adsorption on a field-electron emitter can be used for pressure indication in ultrahigh vacuum systems. Research has proved that for hydrogen which is the dominant component of the residual gas in such systems, there is a linear relationship between the measured rate of adsorption and the pressure reading on a Bayard–Alpert gauge. The highest pressure that can be determined by this method is limited by the maximum measuring speed; the lowest by the necessity to have a certain number of particles adsorbing on the small emitter surface within a reasonable course of time so that adsorption can be measured with a certain accuracy. This method can be used in the pressure range from 10−9 to 10−13 Torr.
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