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The reactivity of adsorbed Na atoms probed by coadsorbed CH3OH
1984 (Engelska)Ingår i: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 146, nr 1, s. 43-60Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The chemical properties of sodium atoms adsorbed on a Cu(111) surface have been probed by coadsorbed methanol. Methoxide, stoichiometrically close to CH3ONa2, is identified as a product by photoemission spectroscopy. Sodium atoms are found to react in the same manner at all submonolayer coverages, i.e. independent of atomic charge. Films of closely packed Na atoms - the first sp-metal substrate probed by methanol - are slightly less reactive. Hartree-Fock-Slater cluster calculations as well as observed energy shifts of a Cu electronic surface state indicate a transfer of charge from the copper substrate to the methoxide group. The desorption temperature for a monolayer of methanol molecules from a Cu(111) surface is enhanced by the presence of low sodium concentrations (1/20 of a monolayer). CH3OH is found to adsorb associatively on the uncovered Cu(111) surface.

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1984. Vol. 146, nr 1, s. 43-60
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URN: urn:nbn:se:ltu:diva-10113DOI: 10.1016/0039-6028(84)90227-9Lokalt ID: 8dc13040-386a-11dd-8721-000ea68e967bOAI: oai:DiVA.org:ltu-10113DiVA, id: diva2:983053
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Upprättat; 1984; 20080612 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2017-11-24Bibliografiskt granskad

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