Abstract
Concentrations of hydrogen dissolved in nickel under hydrogen ion bombardment have been measured using a nickel diffusion tube as the cathode in a glow discharge. No increase above the normal was observed when clean nickel was bombarded. Increases of several orders of magnitude were obtained in the range near 200°C when the nickel was coated with nickel oxide or barium oxide. It is believed that energetic ions penetrate the outer surfaces of these materials efficiently and are then trapped in the interior by surface barriers. These data show that normal values of concentration cannot be applied to nickel and probably many other metals operating under hydrogen ion bombardment if their surfaces are contaminated.
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