Fig. 3From: Infrared, Raman and Magnetic Resonance Spectroscopic Study of SiO2:C NanopowdersThe comparison of Raman spectra measured in SiO2:C samples annealed at 700 and 800 °C with 514.5 nm excitation (a) along with the Raman spectra measured in SiO2:C sample annealed at 800 °C with different excitations (b)Back to article page