Comparison of Bond Character in Hydrocarbons and Fullerenes
  We present a comparison of the bond polarizabilities for carbon-carbon bonds in hydrocarbons and fullerenes, using two different models for the fullerene Raman spectrum and the results of Raman measurements on ethane and ethylene. We find that the polarizabilities for single bonds in fullerenes and hydrocarbons compare well, while the double bonds in fullerenes have greater polarizability than in ethylene. 
D.W. Snoke (University of Pittsburgh), M. Cardona (Max-Planck-Institut   FKF), S. Sanguinetti and G. Benedek (INFM, U. Milano)