Grazing-Incidence X-Ray Study of the Structures and Phase Transitions of Hydrogen on Tungsten (100)

摘要

The paper reports a synchrotron x-ray diffraction study of the tungsten (100) surface reconstruction induced by the chemisorption of hydrogen at room temperature. The 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.