What is the significance of width of D peak in Raman spectrum of disordered graphite (amorphous carbon)?

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Sujoy Sarkar

Width of D band ( or FWHM) in the Raman spectrum implies the disorderness of the material, here graphite. The width of the peak also increases due to the site-to-site variation in the number of next nearest neighbors, that is, when sp2 C atoms have sp3 C neighbors. But the FWHM of the peak depends on the excitation energy.