Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 15: C/diamond I

HL 15.1: Talk

Tuesday, March 24, 2009, 09:30–09:45, POT 51

Subtractive combination modes in the intermediate frequency region of the Raman spectrum of carbon nanotubes — •Daniel Niesner, Jonas Röhrl, Ralf Graupner, and Martin Hundhausen — Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse 1, 91058 Erlangen, Germany

Raman spectroscopy has become a widely used tool for the investigation of carbon nanotubes. The Raman spectrum of carbon nanotubes is dominated by the prominent features in the high and low frequency region. Apart from those in the intermediate frequency region between 400 and 1000 cm^-1 several less intense Raman modes are observed which result from higher order scattering. By measuring the temperature dependence of the intensity of these modes we identified subtractive combination modes which result from processes in which one phonon is created and another one is annihilated. From our measurements we estimate the frequencies of the phonons involved in the process.