Permeability of Hydrogen and Ion Emission Current Characteristics of Palladium Needles

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  • 針状パラジウム電極の水素透過特性とイオン放射特性
  • シンジョウ パラジウム デンキョク ノ スイソ トウカ トクセイ ト イオン

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A new type of proton ion source which has a palladium needle is proposed. Palladium has the highest permeability of hydrogen among metals. The permeability increases with temperature and the hydrogen pressure. The hydrogen permeated through the palladium needle is utilized for the raw material of the ionization. This system is basically the same structure as the field ion microscopy(FIM). The palladium needle，which is processed to be a sharp needle by means of electrolytic erosion，is welded to a stainless tube. Hydrogen molecules permeated through the palladium needle are expected to become protons due to high electric field at the apex. The hydrogen permeability was measured as a function of temperature，for the hydrogen pressures of 1.5 to 3 atm，estimated at the inlet stage of the stainless tube. The permeability has a tendency to increase with the temperature and was measured to be 2.0 x 10⁻⁵ Torr・1/sec at 600⁰C and 1.5atm. This value of the hydrogen permeability should be sufficient for the proposing ion source. Tentative experimental results of ionization obtained for the palladium needle will be given.

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