OSCILLATOR STRENGTHS OF INFRARED ACTIVE VIBRATIONS OFC70DETERMINED BY HIGH-RESOLUTION ELECTRON ENERGY-LOSS SPECTROSCOPY

L.-M. Yu, K. Hevesi, B.-Y. Han, J.-J. Pireaux, P.A. Thiry, R. Caudano and Ph. Lambin
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L.-M. Yu: Laboratoire Interdisciplinaire de Spectroscopie Electronique, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
K. Hevesi: Laboratoire Interdisciplinaire de Spectroscopie Electronique, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
B.-Y. Han: Laboratoire Interdisciplinaire de Spectroscopie Electronique, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
J.-J. Pireaux: Laboratoire Interdisciplinaire de Spectroscopie Electronique, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
P.A. Thiry: Laboratoire Interdisciplinaire de Spectroscopie Electronique, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
R. Caudano: Laboratoire Interdisciplinaire de Spectroscopie Electronique, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium
Ph. Lambin: Laboratoire de Physique du Solide, Institute for Studies in Interface Sciences, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium

Surface Review and Letters (SRL), 1995, vol. 02, issue 06, 705-710

Abstract: The intramolecular vibrations of aC70epitaxial film have been studied by high-resolution electron energy-loss spectroscopy (HREELS). The spectral response of infrared active vibrations has been separated from the specular spectra based on a detailed angular distribution analysis of the scattered electrons. With the help of the oscillator frequencies and the damping ratios determined by optical absorption measurements, the oscillator strengths of theC70dipole active modes between 400 and1500cm−1are accurately determined by fitting the dipole contributions of the HREELS spectrum in the framework of the dielectric theory. Moreover, our experiment confirms that there are infrared active vibrations below400cm−1, which were predicted by molecular dynamical calculations forC70.

Date: 1995
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DOI: 10.1142/S0218625X95000625

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