Vibrational modes of the Cu(100)-c(2x2)-Pd surface

Per Stoltze, J.B. Hannon, H. Ibach

Research output: Contribution to journalJournal articleResearchpeer-review


The vibrational modes of the surface have been measured using electron-energy loss spectroscopy. The measured mode energies are compared to dynamical models with parameters taken from effective medium theory. Strong Pd-Cu interplanar bonding gives rise to nearly degenerate Pd and Cu vibrations (95 cm(-1)) at the (X) over bar point, despite the large mass difference of the ions. Upon low-temperature annealing of the surface, overlayer islands of pure Cu coalesce and order. These overlayer islands are characterized by a high-energy vibrational mode near 128 cm(-1) which grows in intensity upon annealing.
Original languageEnglish
JournalSurface Science
Issue number1-3
Pages (from-to)63-70
Publication statusPublished - 1996


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