Abstract
First-order and second-order Raman scattering can reveal the phase transformation from graphite to amorphous carbon. Analysis of C ij (ω) and coupling of light to vibrational states of amorphous carbon permits a rough identification of possible Raman active overtones of graphite. Low frequency Raman scattering is observed here for disordered state, where acoustic phonons can be seen in Raman scattering due to relaxation of selection rule.
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