Interaction of Hydrogen Beams with Metal Surfaces

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Abstract
The angular distributions of hydrogen scattered from the surfaces of polycrystalline platinum and molybdenum, and from the (100), (111), and (110) faces of molybdenum single crystals have been measured. With platinum both a sharp specular peak and a subspecular peak have been observed, and these diminish in intensity as the surface becomes covered with hydrogen. The second peak is thought to result from diffraction. On a clean polycrystalline molybdenum surface, 68% of the incident beam is chemisorbed, 24% is diffusely reflected, and 8% is specularly reflected. It is found that the diffuse and specular components come from different crystal faces, the (100) and (111) faces giving predominantly diffuse scattering and the (110) face specular reflection.

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