Electron - phonon interaction in C 70

The matrix elements of the deformation potential of C 70 are calculated by means of a simple, yet accurate solution of the electron-phonon coupling problem in fullerenes, based on a parametrization of the ground state electronic density of the system in terms of sp 2+x hybridized orbitals. The value of the calculated dimensionless total electron-phonon coupling constant is λ ≈ 0.1, an order of magnitude smaller than in C 60 , consistent with the lack of a su-perconducting phase transition in C 70 A 3 fullerite, and in overall agreement with measurements of the broadening of Raman peaks in C 70 K 4. We also calculate the photoemission cross section of C − 70 , which is found to display less structure than that associated with C − 60 , in overall agreement with the experimental findings.