Abstract
The initial stages of oxygen adsorption on Ni 3 Al (110) at 9700 K have been studied by scanning tunneling microscopy (STM) and low energy electron diffraction (LEED). We report the observation of two different reconstructed surface phases. First, on the well-ordered surface, after exposure to O 2 at 970 K for doses <5L, a saturation coverage (1/4 ML) of Ni 3 Al {110} c(2×2)- O is observed. Secondly, we report an oxygen-induced reconstruction which is incommensurate with the substrate, resulting after an incomplete annealing of the suface following Ar + bombardment. A structure model for this phase is proposed.
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