Abstract
We report the measurement of infrared transmission of large C60 single crystals. The spectra exhibit a very rich structure with over 180 vibratonal absorptions visible in the 100-4000 cm-1 range. Many silent modes are observed to have become weakly IR active. We also observe a large number of higher-order combination modes. The temperature (77-300 K) and pressure (0-25 kbar) depedences of these modes were measured and are presented. Careful analysis of the IR spectra, in conjuction with Raman scattering data showing second-order modes and neutron scattering data, allows the selection of the 46 vibrational modes of C60. We are able to fit all of the first- and second-order data seen in the present IR spectra and the previously published Raman data (∼300 lines total), using these 46 modes and their group-theory-allowed second-order combinations.
| Original language | English |
|---|---|
| Pages (from-to) | 173-183 |
| Number of pages | 11 |
| Journal | Physical Review B |
| Volume | 50 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1994 |
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