Surface stress changes resulting from molecular oxygen and carbon monoxide adsorption on platinum {lcub}111{rcub}

Platinum has superior catalytic properties and has been used extensively in industrial applications, however, severe degradation of the catalyst results from contaminating adsorbates poisoning the surface. For this reason, the behavior of adsorbates on the Pt {lcub}111{rcub} surface is of great interest.; Through the introduction of oxygen and carbon monoxide onto the surface of Pt {lcub}111{rcub} in an ultra-high vacuum environment, combined with the use of an in situ high resolution surface stress monitor, additional insight into the behavior of these adsorbates on a Pt {lcub}111{rcub} surface was developed. By coupling the adsorbate-surface and adsorbate-adsorbate interactions with the surface stress they induce, a correlation between surface stress measurements and the structural rearrangement of those adsorbates was established. Furthermore, energy states as a function of adsorbate density were calculated showing the surface strain energies associated with the transition between ordered phases.