Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)
O 36.28: Poster
Montag, 7. März 2005, 15:00–18:00, Poster TU F
Surface vibrations of clean and hydrogen terminated silicon (100) and (110) surfaces — •M. Eremtchenko1, R. Öttking1, F. S. Tautz2, and J. A. Schaefer1 — 1TU Ilmenau, Institut für Physik und Zentrum für Mikro- und Nanotechnologien, P.O. Box 100565, 98684 Ilmenau, Germany — 2School of Engineering and Science, International University Bremen, 28759 Bremen, Germany
We present a comprehensive study of the clean and hydrogen terminated silicon (100) and (110) surfaces by means of high resolution electron energy loss spectroscopy (HREELS). The phonon modes assignment to the calculated atomic displacement patterns and the phonon modification by the surface treatments is emphasized. The measured data of the vibrational modes of clean Si(100) and (110), as well as of the monohydrides of these surfaces are reported. The comparison of the mono- and dihydride phonon spectra of Si(100) reveals the modes related to the dimer bond and the shift of the phonon frequencies due to either hydrogen or deuterium termination is discussed. We discuss the correspondence of the phonon modes of the clean and hydrogen terminated Si(110) surfaces with respect to the assigned calculated data.