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UPS spectra of H2O, CH3OH and C5H9OH adsorbed onto Cu(111)/Na and Na(cp)
1985 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 160, no 2, p. 599-617Article in journal (Refereed) Published
Abstract [en]

The present communication presents ultraviolet photoemission spectra (UPS) of three different "alcohols"; water (H2O), methanol (CH3OH), and cyclopentanol (C5H9OH), chemisorbed onto a Cu(111) surface partially covered by sodium atoms as well as onto closely packed sodium films, a free electron adsorbent. Whereas all three alcohols ROH bind reversibly and associatively to Cu(111) they react with adsorbed sodium atoms to metal bound alcoxides RO. The chemisorption bond, characterized by the interaction between O 2pπ orbitals and metal atoms as an electron donor, the alcoxide being the acceptor, is similar for all groups R. The O 2pπ orbitals shift to higher UPS binding energies with increasing electron density, i.e. decreasing rs/ao of the sodium overlayer. Only for HONa, the sterically smallest group R, does the alcoxide growth continue in three dimensions. Although, possibly failing to reproduce the electron density profile of a free electron surface, Hartree-Fock-Slater cluster calculations of small models ROH and RONa3 enable correlations to be made between UPS intensity peaks and one electron orbitals.

Place, publisher, year, edition, pages
1985. Vol. 160, no 2, p. 599-617
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Other Physics Topics
Research subject
Fysik
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URN: urn:nbn:se:ltu:diva-11530DOI: 10.1016/0039-6028(85)90797-6ISI: A1985ARG8000025Scopus ID: 2-s2.0-0000138781Local ID: a87aa910-386b-11dd-8721-000ea68e967bOAI: oai:DiVA.org:ltu-11530DiVA, id: diva2:984480
Note
Upprättat; 1985; 20080612 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-05-08Bibliographically approved

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