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The adsorption of oxygen on two different stepped Ru(001) surfaces (n(001) x 1(010) with n = 13 or 39) was investigated by LEED. For the high (low) step density surface, saturation with oxygen leads to a (2 x 2) LEED pattern with broadened spots of sixfold symmetry at normal incidence in the temperature regime between 300 and 500 (750) It. This is due to the incoherent superposition of diffraction...
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