Field desorption of helium and neon from tungsten and iridum

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Abstract
The first complete crystallographic distribution of helium and neon field adsorbed on tungsten and iridium surfaces has been determined using field desorption mass spectromatry. At 80 K He+ is removed from tungsten at high work function areas. The absence of He+ in other regions indicates that either helium is not adsorbed, or that it is removed from the surface as a WHe3+ molecular ion during field evaporation of the substrate, which is required for He+ detection. Helium adsorbed on iridium at 80 K may form IrHe3+ and neon IrNe2+ near prominent zone lines. The absence of ion species in specific crystallographic regions of iridium and tungsten suggests care when interpreting atom probe results in certain metallurgical applications.

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