Abstract
A theoretical study is presented of the vibrations of C 60 H 60 , the saturated hydride of the soccerball molecule C 60 , and the results are compared with features in the spectrum of the unidentified infrared emission. A simple force-field model with standard constants is adopted for C 60 H 60 , and also for the laboratory species C 20 H 20 as a check. The properties of the nine active vibrations of the model of C 60 H 60 , and the distribution over frequency of all the vibrations, are given. The wavelengths of several of the active modes are found to lie within a few per cent of those of features known in the unidentified infrared emission. An outstanding characteristic of the model is the large number of modes associated with the rocking of C-H units; the number density of these modes has a broad peak between 6 and 10 μm that is not unlike the 6-9 μm plateau, the strongest feature in the unidentified infrared emission
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