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

Research output: Contribution to journalArticle

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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

Fingerprint

Acetylene
Low energy electron diffraction
Photoemission
acetylene
Ethylene
ethylene
photoelectric emission
electron diffraction
Adsorption
adsorption
Ultraviolet photoelectron spectroscopy
ultraviolet spectroscopy
energy
photoelectron spectroscopy
Molecules
electronic levels
Chemisorption
Platinum
chemisorption
surface reactions

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Ultraviolet photoemission studies of acetylene and ethylene adsorptions on the Pt(111) surface : Correlations with LEED studies. / Lo, W. J.; Chung, Y. W.; Kesmodel, L. L.; Stair, Peter C; Somorjai, G. A.

In: Solid State Communications, Vol. 22, No. 6, 1977, p. 335-337.

Research output: Contribution to journalArticle

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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.",
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AU - Stair, Peter C

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