Abstract
AbstractBy mass spectrometry of residual gas in UHV‐arc‐chambers a cycle of production of methane has been found for clean electrodes, consisting in release of hydrogen during the arc, its re‐adsorption on freshly formed metal surfaces, followed by surface reactions of hydrogen with carbon impurities, and finally desorption of the resulting methane at room temperature after the arc. Existing methane is decomposed in part during an arc. In the pressure region ≦ 10−4 Pa most of the residual gas is transformed to CH4 if the electrodes contain metals with high gettering activity.
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