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Title

Vibrations of alkali metal overlayers on metal surfaces

AuthorsRusina, G. G.; Eremeev, S. V.; Echenique, Pedro M. ; Benedek, G.; Borisova, S. D.; Chulkov, Eugene V.
Issue Date13-May-2008
PublisherInstitute of Physics Publishing
CitationJournal of Physics: Condensed Matter 20, 224007 (2008).
AbstractWe review the current progress in the understanding of vibrations of alkalis adsorbed on metal surfaces. The analysis of alkali vibrations was made on the basis of available theoretical and experimental results. We also include in this discussion our recent calculations of vibrations in K/Pt(111) and Li(Na)/Cu(001) systems. The dependence of alkali adlayer localized modes on atomic mass, adsorption position and coverage as well as the dependence of vertical vibration frequency on the substrate orientation is discussed. The square root of atomic mass dependence of the vertical vibration energy has been confirmed by using computational data for alkalis on the Al(111) and Cu(001) substrates. We have confirmed that in a wide range of submonolayer coverages the stretch mode energy remains nearly constant while the energy of in-plane polarized modes increases with the increase of alkali coverage. It was shown that the spectrum of both stretch and in-plane vibrations can be very sensitive to the adsorption position of alkali atoms and substrate orientation.
Description10 pages.
Publisher version (URL)http://dx.doi.org/10.1088/0953-8984/20/22/224007
URIhttp://hdl.handle.net/10261/7406
DOI10.1088/0953-8984/20/22/224007
ISSN0953-8984
Appears in Collections:(CFM) Artículos
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