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Light emission excited by scanning tunnelling microscopy (STM) has been observed on multiwall
carbon nanotubes. The photon yield depends on the scanned tube but it is constant all along the tube.
Simultaneous photon spectroscopy evidences emitted wavelengths in the 600−1000 nm range in good
agreement with previous field emission data. Emission characteristics are independent of substrate and of STM tip. We discuss how these new results are consistent with radiative transitions involving localized
states in carbon nanotubes.
We present infrared spectra of linear and planar polymeric structures consisting of C60 balls. The splittings of infrared lines can be explained fairly well on the basis of symmetry reduction, indicating that the structures are ordered. Increasing the temperature results in breaking of intermolecular bonds. This process is reversible in the alkali salts but irreversible in the neutral rh-C60 polymer; we conclude that charged C60 balls are more stable in polymer form than as monomers, while for neutral C60 the situation is reversed.
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