Probing ultrafast dynamics of soot in situ in a laminar diffusion flame using a femtosecond near-infrared laser pump and multi-color Rayleigh scattering probe spectroscopy

Author:

Zhang Wei1,Liang Tianfeng1,Fu Yao1,Chen Shanming1,Zang Hongwei1,Xu Huailiang123ORCID

Affiliation:

1. Jilin University

2. East China Normal University

3. CAS Center for Excellence in Ultra-Intense Laser Science

Abstract

Soot nanoparticles result from incomplete combustion of fossil fuels, and have been exhibited, when released into the atmosphere, to be detrimental to air quality and human health. However, because of the inert and non-luminescent properties, probing the dynamics of soot in situ is still a challenge. Here we report a strong near-infrared laser pump and multi-color Rayleigh scattering probe approach to reveal soot dynamics in situ in a n-pentanol/air laminar diffusion flame at femtosecond time resolution. A size-dependent dynamical process of the pump-laser-induced soot swelling at femtosecond time scale and subsequent shrinking back to its original size at picosecond time scale is observed, in which both the swelling rise time and the shrinking decay time increase monotonically as the initial sizes of soot nanoparticles become larger. By characterizing the evolution time and intensity of the multi-color scattered probe light, the spatial distributions of different sizes of soot particles from the inception to the burnout regions of the flame are mapped, which provide useful information on exploring the formation and growth mechanisms of soot particles in flames.

Funder

National Natural Science Foundation of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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