We present an X-ray diffraction study of the polished, unreconstructed diamond (111) surface. By measuring the distribution of diffracted intensities along the (hk)=(10) crystal truncation rod, we have determined the structure of the unreconstructed surface. We find that after heating to 650 °C, the polished diamond(111)-(1 x 1) surface exhibits a single-bond cleavage plane terminated by hydrogen atoms and, for 15% of the surface area, by adsorbed oxygen, most likely in the form of hydroxyl groups. We observe relaxations in the first layers, most notably a 3% contraction between the first and second bilayer. AFM results are presented that confirm the morphology found in X-ray analysis. Medium-energy ion scattering was used to determine the oxygen coverage.

Additional Metadata
Journal Surf. Sci.
Huisman, W. J, Peters, J. F, de Vries, S. A, Vlieg, E, Yang, W. S, Derry, T. E, & van der Veen, J. F. (1997). Structure and morphology of the as-polished diamond(111)-1x1 surface. Surf. Sci., 387, 342–353.