Bench tests for microscopic theory of Raman scattering in powders of disordered nonpolar crystals: Nanodiamonds and beyond

Recent Raman data on nanocrystallite arrays are revised within the microscopic theory for peaks positions and broadening (linewidth). The combines elasticity theory-like approach optical phonons used in order to evaluate structure Green's function method applied phonon lines broadening. These theories supported by atomistic calculations dynamical matrix bond polarization model calculate intensities. experimental four various nanopowders analyzed with use of this theory. large width peak nanoparticles as compared corresponding bulk materials inverse dependence particle size previously observed other researchers explained framework It is shown that capable extract confidently from important characteristics nanopowder including mean size, variance distribution function, strength intrinsic disorder particle, effective faceting number parameterizes shape.