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X-ray Scattering Measurements of the Ag(111) Surface Thermal Expansion

  • Cristian E. Botez (a1), William C. Elliott (a1), Paul F. Miceli (a1) and Peter W. Stephens (a2)


We have used synchrotron X-ray diffraction to study the thermal expansion of the Ag(111) surface. Throughout the temperature interval between 300 and 1100K, we observed that the separation between the first and the second atomic layers at the surface, 12 d, differs from its bulk counterpart, d, by less than 1%, indicating that the thermal expansion at the surface is similar to the one in the bulk. This result represents the first experimental confirmation of the predictions from molecular dynamics simulations, which indicate a small enhancement of the anharmonic effects at this surface.



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