https://doi.org/10.1007/s100510070157
Resonance Raman excitation and electronic structure of the
single bonded dimers (C
and (C59N)2
1
Universität Wien, Institut für Materialphysik, Strudlhofgasse 4, 1090 Wien, Austria
2
Institut für Festkörper- und Werkstofforschung, 01171 Dresden, Germany
3
Comenius University, Faculty of Mathematics and Physics, 80 000 Bratislava, Slovakia
4
School of Chemistry, Physics and Environmental Science, University of Sussex, BN1 9QJ Brighton, UK
Received:
25
January
2000
Revised:
10
April
2000
Published online: 15 September 2000
Raman spectra are presented for the single
bonded dimeric fullerene (C and compared to optical
spectra and Raman spectra of the
isostructural and isoelectronic heterofullerene (C59N)2. The
spectra of both materials exhibit strong correlations with
respect to splitting, line position, and line intensity. This holds
for non resonant excitation with blue and green lasers as well as
for the strong resonances observed with red lasers. The latter
observation is consistent with a downshift for the electronic
transition energies as compared to C60.
The absorption edge of thin films of
(C59N)2 was found at 1.4 eV. The three intercage modes
were observed at 82, 103, and 111, and at 88, 98, and 106 cm-1
for (C59N)2 and (C, respectively. A surprising
difference was found for the
position of the pentagonal pinch modes in the two materials as they were
observed at
1461 and at 1451 cm-1, for (C59N)2 and (C,
respectively. This is interpreted as a consequence of some
characteristic differences in the electronic structure
of the two compounds.
PACS: 61.46.+w – Clusters, nanoparticles, and nanocrystalline materials / 63.20.Dj – Phonon states and bands, normal modes, and phonon dispersion / 78.30.-j – Infrared and Raman spectra
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
