The Pt(997) surface when heated in oxygen environment (5×10-9-10-7mbar) appears to reconstruct in the temperature range 600-900 K. The reconstructed surface is characterized (LEED) by steps of double height. The dynamics of the double step formation and destruction was studied by monitoring the intensity of a fractional order He-diffraction peak, which is characteristic of the reconstructed structure. Oxygen chemisorbed at the double height steps with a binding energy of about 80 kcal mole plays a determining role in the build-up and stabilization of these steps. The rate determining factor of build-up and decay of the reconstructed surface appears to be, at low temperatures, the self-diffusion of Pt atoms and, at high temperatures, the availability of chemisorbed oxygen. © 1982.
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