High-resolution low-energy-electron-diffraction (LEED) measurements of the specular beam from W(110) are presented. A new LEED fine structure associated with the (2̄0) beam threshold is observed and studied in detail. The evolution of this feature under hydrogen chemisorption is also examined. Modification of the fine-structure line shape with gas coverage is explained by a gradual change in the scattering properties of the substrate rather than by a transformation of its surface potential barrier. The strengthening of the fine structure with gas exposure could be indicative of an ordered chemisorption in an interstitial site for hydrogen on W(110).
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Baribeau et al. (1982) studied this question.
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