Raman spectrum and stability of(C59N)2

Raman spectra of $({\mathrm{C}}_{59}\mathrm{N}{)}_2$ are presented for excitation with various laser lines and for temperatures between 100 and 500 K. The material exhibits a reliable stability versus laser irradiation for the full temperature range and a remarkable resonance enhancement of the scattering cross section for red light excitation. The spectra show a strong relation to those of ${\mathrm{C}}_{60},$ particularly in the spectral range of the tangential modes. Calculations of the mode frequencies with the semiempirical AM1 technique reveal good agreement with the observed Raman lines, in particular for the three intermolecular modes observed at 82, 103, and 111 ${\mathrm{cm}}^{-1}.$