Abstract
We report on scanning tunneling microscopy and infrared reflection absorption spectroscopy investigations of the stepped Pt(997) surface. The surface shows a regular terrace-step-structure with only moderate variations of the terrace widths with respect to the nominal structure. The adsorption of CO as well as the coadsorption of hydrogen and CO is studied. It is shown that covering the surface with a full monolayer of hydrogen at 165 K provides its complete passivation against adsorption from the residual gas atmosphere, without affecting the terrace-step-configuration. Thus the surface can be kept clean in UHV over months, a necessary precondition to serve as diffractive element in atom beam optics.
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