Raman Scattering of Ultrafine Diamond Obtained from Detonation

Raman spectra of ultrafine diamond obtained from detonation are measured. The characteristic Raman bands assigned to sp3 diamond and sp2 graphite have been observed at around 1 321 cm-1 and 1 600 cm-1, respectively, in which the sp3 diamond band is asymmetric with the half-peak width of about 30 cm-1, with a tail towards lower Raman frequency and a shift of about -10 cm-1. The results obtained from Raman spectrum agree with that from X-ray diffraction.