Intermolecular vibrations in pure and doped C60

Autor:	Helmut Schober, F. Gompf, P. Adelmann, R. Heid, B. Renker, H. J. Bornemann
Rok vydání:	1993
Předmět:	Materials science Phonon Intermolecular force Inelastic scattering Neutron scattering Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials Nuclear magnetic resonance Intramolecular force Density of states General Materials Science Neutron Spectroscopy
Zdroj:	Zeitschrift f�r Physik B Condensed Matter. 92:451-455
ISSN:	1434-6036 0722-3277
DOI:	10.1007/bf01320507
Popis:	We discuss the results of inelastic neutron time-of-flight spectroscopy on powder samples of C60, K3C60 and Rb3C60. A well structured density of states is obtained from the raw data where the details can be attributed to translational acoustic/optic and librational modes. The intermolecular excitation spectra for all three compounds can be well understood within the frame-work of lattice dynamics of a molecular crystal. We show that a particular sample preparation is necessary to avoid impurity contributions in particular within the gap region between inter- and intramolecular vibrations. There are indications for a weak anomalous temperature dependence of low energy phonons in K3C60 atT c .
Databáze:	OpenAIRE
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