Multiwavelength Raman spectroscopy analysis of a large sampling of   disordered carbons extracted from the Tore Supra tokamak
  Disordered carbon often exhibit a complex Raman spectrum, with four to six components. Here, a large variety of disordered carbons, forming a collection of samples with a great variety of structures, are analysed using multi-wavelength Raman microscopy (325.0, 514.5, 785.0 nm). They allow us to extend Raman behaviour known for nano-crystalline graphite to amorphous carbons, (dependence with the excitation wavelength) and other known for amorphous carbons to nano-crystalline graphite, (differentiation of the smallest cluster size probed using different excitation wavelengths). Experimental spectra were compared to simulated spectra, built using known laws, to evidence a new source of broadening. 
Cedric Pardanaud (PIIM), C. Martin (CRISMAT), P. Roubin (PIIM)
physics.chem-ph cond-mat.mtrl-sci