Raman spectra of soot particles were monitored in the gaseous flow extracted from the burning regions of two low-pressure premixed ethylene flames, for the first time. The flame conditions were chosen to explore the diversity of soot nanostructure in slightly sooting flames. Evaluation of the Raman spectral parameters revealed that the soot particles exhibited a strongly disordered structure and a large proportion of sp hybridization of the carbon. The appearance of sp carbon chains composing up to 30% of the total carbon content as well as an olefinic component may indicate their important role in soot nucleation and growth in low pressure ethylene flames. Hence, Raman spectroscopy of soot particles in the aerosol phase revealed that accretion and cyclization of the aliphatic carbon including sp carbon chains could thus be of importance for the initial soot growth and require more investigation.

首次监测了从两个低压预混乙烯火焰的燃烧区域提取的气流中烟尘颗粒的拉曼光谱。选择火焰条件以探究微烟尘火焰中烟尘纳米结构的多样性。拉曼光谱参数的评估表明，烟灰颗粒表现出很强的无序结构和很大比例的碳sp杂化。占总碳含量高达30％的sp碳链以及烯烃成分的出现可能表明它们在低压乙烯火焰中的烟灰成核和生长中起重要作用。因此，