Abstract
We report a synchrotron x-ray diffraction study of the tungsten (100) surface reconstruction induced by the chemisorption of hydrogen at room temperature. Our experiments verify previously deduced phase boundaries but they suggest a new interpretation of the phases, the most interesting being that the weakly incommensurate ``solid'' is actually a surface fluid. These experiments also illustrate the utility of x-rays in obtaining quantitative intensity and line-shape information in chemisorbed surface systems.
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