The quantity and temperature dependence of gas released by stainless steel in vacuo following various forms of cleaning have been investigated using a high resolution mass spectrometer. The samples to be studied were introduced through a series of vacuum locks into a small oven attached to the ion source of the mass spectrometer. Each sample was heated over a period of four hours to a temperature of 450 C at which it was maintained for 16 hours. After cool¬ing it was exposed to the air for 24 hours and the amount of gas readsorbed was investigated by an identical procedure.
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