《Table 4–Comparison of different three-band fitting methods for spectrum from the diesel soot measur

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《Raman spectroscopy of diesel and gasoline engine-out soot using different laser power》

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We studied engine-out soot samples collected from a heavyduty direct-injection diesel engine and port-fuel injection gasoline spark-ignition engine.The soot samples are characterized using Raman spectroscopy with different laser power We find that high laser power may cause oxidation of soot which gives higher D/G intensity ratio.We also find that diesel soot has higher amorphous/graphitic C compared to gasoline soot，which is also reflected as higher D/G intensity ratio measured under the same laser power.The method can be applied to characterize different soot samples.The value of D/G intensity ratio may be linked to oxidation reactivity of the soot samples that determines the regeneration efficiency of Table 5–Curve-fitting results of all spectra from both soot samples using 3-band fitting（2L1G）method.