Gettering of Residual Gas and the Adsorption of Hydrogen on Evaporated Molybdenum Films at Liquid-Nitrogen Temperatures
It has been established that evaporated molybdenum films at room temperature are effective adsorbers of hydrogen and most residual gases in ultrahigh-vacuum systems . Preliminary experiments indicated additional adsorption was possible if the molybdenum was evaporated onto a liquid-nitrogen-cooled surface. The objectives of the present experiments were: (1) to ascertain the magnitude of the pressure reduction due to adsorption in a baked vacuum system as compared with an unbaked system; (2) to identify the gaseous components adsorbed; and (3) to measure the pumping speed of hydrogen on molybdenum films at room and liquid-nitrogen temperatures.
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