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Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2015

Calculations of the Mass Absorption Cross Sections for carbonaceous nanoparticles modeling soot

Résumé

In this paper we use an atomistic model to calculate the mass specific absorption cross section coefficient of carbonaceous particles of nanometer size. The carbonaceous particles are built numerically to reproduce most of the structural characteristics of soot nanoparticles emitted in the Troposphere from combustion sources. Our model is based on the knowledge of the atomic positions and polarizabilities inside the nanoparticle and is used to study the influence of the atomistic characteristics of these nanoparticles on their optical properties. The results clearly show that the chemical composition of the soot nanoparticle may have a sufficiently strong impact on the MAC curves to allow detection of chemical differences by using UV-visible spectroscopic measurements, in a well-suited wavelength range, i.e., typically between 200 and 350 nm. In a more general way, our calculations show that MAC values as well as differences between MAC curves corresponding to different nanoparticles may strongly vary with wavelength. As a consequence, measurements at a given wavelength only is certainly not representative of the absorption properties of these nanoparticles and thus should be considered with caution.
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Dates et versions

hal-02131422 , version 1 (16-05-2019)

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C. Fernandez, S. Picaud, Michel Devel. Calculations of the Mass Absorption Cross Sections for carbonaceous nanoparticles modeling soot. Journal of Quantitative Spectroscopy and Radiative Transfer, 2015, 164, pp.69 - 81. ⟨10.1016/j.jqsrt.2015.05.011⟩. ⟨hal-02131422⟩
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