Berlin 2008 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 11: C/diamond
HL 11.7: Talk
Monday, February 25, 2008, 12:30–12:45, EW 202
Phonon symmetries of carbon picotubes — •Nils Rosenkranz1, María Machón1, Rainer Herges2, and Christian Thomsen1 — 1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany — 2Institut für Organische Chemie, Christian-Albrechts-Universität Kiel, Otto-Hahn-Platz 4, 24098 Kiel, Germany
Picotubes are ring-shaped hydrocarbons closely related to very short carbon nanotubes. They seem to be a promising starting point for the specific synthesis of nanotubes, which is one of the great goals in nanotube research. We identified the symmetries of all main modes in the Raman spectrum of semitrimer picotubes by performing polarization-dependent Raman measurements on crystalline samples. Furthermore, the semitrimer molecule has been subject to ab initio calculations, the results of which agree excellently to the experimental data. By comparing experiment and theory, we can assign phonon eigenvectors to all main Raman peaks.