Ultraviolet photoemission studies of acetylene and ethylene adsorptions on the Pt(111) surface: Correlations with LEED studies

W. J. Lo, Y. W. Chung, L. L. Kesmodel, Peter C Stair, G. A. Somorjai

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Abstract

The chemisorption of acetylene and ethylene on platinum (111) surfaces for T ≥ 300 K has been studied with ultraviolet photoelectron spectroscopy (UPS) at 21.2 eV. An activated metastable-stable acetylene transition observed recently in low-energy electron diffraction (LEED) intensity-energy profiles has been seen with the UPS spectra. The upperlying electronic levels of the metastable acetylene state are related to a shifted gas-phase acetylene spectrum. The stable acetylene state appears to involve a stronger molecule-surface interaction and probable rehybridization, consistent with the LEED analysis showing the molecule to be situated in a triangular position at covalent Pt-C distances. Ethylene is founf to dehydrogenate at room temperature to the stable acetylene species on Pt(111) surfaces.

Original languageEnglish
Pages (from-to)335-337
Number of pages3
JournalSolid State Communications
Volume22
Issue number6
DOIs
Publication statusPublished - 1977

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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