Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: Poster I
HL 17.1: Poster
Montag, 25. Februar 2008, 16:30–19:00, Poster D
Infrared spectroscopy on the fullerene C70 under pressure — •Komalavalli Thirunavukkuarasu1, Christine.A. Kuntscher1, Ferenc Borondics2, Gyöngyi Klupp2, and Katalin Kamarás2 — 1Experimentalphysik II, Universität Augsburg, D-86159 Augsburg, Germany — 2Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, P.O.Box 49, Budapest, Hungary H 1525
C70 is the most commonly occurring higher order fullerene next to C60. Although several experimental investigations have been performed on this compound, the properties of C70 is not yet well understood. On cooling, C70 undergoes two orientational ordering transitions, one at 350 K and the other at 280 K which are accompanied by structural phase change [1]. The pressure-induced orientational ordering in C70 is expected around 1 GPa [2]. For a better understanding of the pressure-induced phenomena in C70 we carried out pressure-dependent transmittance measurements on pure C70 compound over a broad frequency range (400-22000 cm−1) for pressures up to 10 GPa. The pressure-induced changes in the vibrational modes and the shift of the electronic absorption edge with increasing pressure are reported. Supported by the DFG.
[1] G. B. Vaughan et al., Chem. Phys. 178, 599 (1993).
[2] H. Kawamura et al., J. Phys. Chem. Solids 54, 1675 (1993).