Abstract
In a sealed ultrahigh-vacuum glass system incorporating a Bayard–Alpert-type ionization gauge at a total pressure of ∼10−10 Torr (obtained with an oil diffusion pump, mechanical fore-pump, and nonrefrigerated trap), it is demonstrated that by turning off the electron accelerating potential (or all gauge potentials) of the ionization gauge, the gas ambient of the system is perturbed by the desorption of Ar from the gauge surfaces. Partial pressure gas measurements are made with an omegatron mass spectrometer. The quantity and rate of Ar desorption is related in a complex way to the previous history of the system. Experimental data for some representative systems are presented.
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