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Nanometre-scale infrared chemical imaging of organic matter in ultra-carbonaceous Antarctic micrometeorites - Astronomy & Astrophysics (A&A)


Nanometre-scale infrared chemical imaging of organic matter in ultra-carbonaceous Antarctic micrometeorites - Astronomy & Astrophysics (A&A)

Jérémie Mathurin, Ariane Deniset-Besseau et Alexandre Dazzi ont publié un article dans le journal Astronomy & Physics en collaboration avec des chercheurs de l’ISMO et du Synchrotron Soleil.

"Nanometre-scale infrared chemical imaging of organic matter in ultra-carbonaceous Antarctic micrometeorites (UCAMMs)"

Aims. The composition of comets and asteroids sheds light on the formation and early evolution of the solar system. The study of micrometeorites containing large concentrations of carbonaceous material (i.e. ultra-carbonaceous antarctic micrometeorites, UCAMMs) allows for unique information on the association of minerals and organics at surface of icy objects (comets) to be obtained.
Methods. In this work we map the organic matter of UCAMMs collected in the Antarctic snow, at sub-wavelength spatial scales using the Atomic Force Microscope InfraRed (AFMIR) technique. The sample preparation did not involve any chemical pretreatment to extract organic matter. The AFMIR measurements were performed on a limited spectral coverage (1900–1350 cm−1) allowing chemical functional groups to be imaged at spatial scales relevant to the study of micrometeorites.

Voir l’article complet sur le site de Astronomy & Physics