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Comparative Raman Study of the 1D and 2D Polymeric Phases of C 60 under Pressure
Author(s) -
Arvanitidis J.,
Meletov K. P.,
Papagelis K.,
Soldatov A.,
Prassides K.,
Kourouklis G. A.,
Ves S.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<443::aid-pssb443>3.0.co;2-o
Subject(s) - raman spectroscopy , softening , degenerate energy levels , polymer , phonon , materials science , polymerization , molecule , symmetry (geometry) , spectral line , molecular vibration , chemical physics , chemistry , molecular physics , condensed matter physics , optics , composite material , physics , organic chemistry , geometry , mathematics , quantum mechanics , astronomy
The effect of symmetry lowering on the phonon spectra as well as the pressure effects on the vibrational spectrum of polymerized C 60 were studied by Raman spectroscopy. Drastic changes related to the splitting of degenerate modes of the C 60 molecule were observed together with selected softening of some of them. In spite of many similarities in the Raman spectra of the one‐ (1D) and two‐dimensional (2D) polymeric forms of C 60 , some salient differences in the peak intensities and the appearance of complementary modes are evident. In the Raman spectrum of the 2D polymer under high pressure, new modes, which may be related to the deformations of molecular cages, appear. The observed pressure effects are reversible and the material remains stable for pressures up to 8.8 GPa.