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Author Cassuto, A. ♦ Mane, M. ♦ Jupille, J. ♦ Tourillon, G. ♦ Parent, P.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ ETHYLENE ♦ ADSORPTION ♦ POTASSIUM ♦ SORPTIVE PROPERTIES ♦ PLATINUM ♦ OXYGEN ♦ PHOTOELECTRON SPECTROSCOPY ♦ DEHYDROGENATION ♦ X-RAY SPECTROSCOPY ♦ DESORPTION
Abstract The variation in amounts of loosely-bonded (usually called {pi}-bonded) and di-{sigma}-bonded ethylene species adsorbed onto Pt(111) at 95 K in the presence of potassium adatoms has been independently followed, using XPS and TDS, as a function of potassium coverage. The obtained results show that, in the neighborhood of potassium atoms, di-{sigma} ethylene formation is inhibited as well as further reactions leading to ethylidyne formation and dehydrogenation. Di-{sigma} bonding is replaced by a weaker bonding and reversible adsorption at about 130 K. The maximum amount of {pi}-bonded ethylene species formed on the Pt(111) surface at 95 K in the presence of potassium or oxygen adatoms has been investigated, using UPS, XPS, and NEXAFS. The interpretation of data has been made using symmetry considerations and selection rules. It indicates that in the presence of oxygen atoms the carbon-carbon double bond plane is parallel to the surface while potassium adatoms induce a strong rotation of this plane along the carbon-carbon axis. 44 refs., 11 figs.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1992-07-09
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 96
Issue Number 14


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