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The (1x1)-> hexagonal structural transition on Pt(100) studied by high-energy resolution core level photoemission
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2007 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 127, no 16Article in journal (Refereed) Published
Abstract [en]

The (1 x 1)-> quasihexagonal (HEX) phase transition on a clean Pt(100) surface was investigated by monitoring the time evolution of the Pt4f(7/2) core level photoemission spectra. The spectral component originating from the atoms forming the (1 x .1) metastable unreconstructed surface was found at -570 +/- 20 meV with respect to the bulk peak. Ab initio calculations based on density functional theory confirmed the experimental assignment. At temperatures above 370 K, the (1 x 1) phase irreversibly reverts to the more stable HEX phase, characterized by a surface core level shifted component at -185 +/- 40 meV. By analyzing the intensity evolution of the core level components, measured at different temperatures in the range of 393-475 K, we determined the activation energy of the phase transformation, E=0.76 +/- 0.04 eV. This value is considerably lower than the one previously determined by means of low energy electron diffraction. Possible reasons for this discrepancy are discussed.

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2007. Vol. 127, no 16
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URN: urn:nbn:se:kth:diva-49016DOI: 10.1063/1.2794344ISI: 000250589400056OAI: diva2:461331
Available from: 2011-12-02 Created: 2011-11-24 Last updated: 2011-12-06Bibliographically approved

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Weissenrieder, Jonas
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