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

The (1x1)-> hexagonal structural transition on Pt(100) studied by high-energy resolution core level photoemission / Baraldi, A.; Vesselli, E.; Bianchettin, L.; Comelli, G.; Lizzit, S.; Petaccia, L.; de Gironcoli, Stefano Maria; Locatelli, A.; Mentes, T. O.; Aballe, L.; Weissenrieder, J.; Andersen, J. N.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 127:16(2007), pp. 1-7. [10.1063/1.2794344]

The (1x1)-> hexagonal structural transition on Pt(100) studied by high-energy resolution core level photoemission

de Gironcoli, Stefano Maria;
2007-01-01

Abstract

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
2007
127
16
1
7
164702
https://aip.scitation.org/doi/10.1063/1.2794344
Baraldi, A.; Vesselli, E.; Bianchettin, L.; Comelli, G.; Lizzit, S.; Petaccia, L.; de Gironcoli, Stefano Maria; Locatelli, A.; Mentes, T. O.; Aballe, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/16574
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