Raman active modes in carbon peapods

The nonresonant Raman spectra of infinite peapod were calculated in the framework of bond-polarization theory by using either direct diagonalisation of dynamical matrix or the spectral moments method. The effect of C60-tube interaction on the mode frequencies both of the peas and the pod has been calculated using the Lennard-Jones, potential showing that the lowest frequency mode region is more affected than the higher one. The tube chiralityʹs and diameter effects on Raman spectra were studied. Also, we show that filling factors of C60 molecules inside some single-walled carbon nanotubes (SWCNT) may induce a splitting of the radial breathing like mode (RBLM) into two components. Comparison with experimental results is reported.