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Raman Studies of Nascent Soot Particles

Raman spectroscopy can be used to study the size of the molecules that make up soot particles.

Raman spectroscopy of soot has two primary bands, the G band (~1600 cm-1)  which comes from the asymmetric stretch of the inner graphitic structure of PAH and the D band. (~1350 cm-1) which is Raman active due to disorder within the plane and edges of PAH.

 Using the ratio of D and G peak intensities, we can determine the conjugation length of the PAH molecules in soot particles.

Six circumpyrene three-stacks forming a PAH cluster.

For more on our work in Raman spectroscopy see our work here.

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