Interpretation of SAM results simulating the Martian surface at SOLEIL synchrotron under X-ray irradiations - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Interpretation of SAM results simulating the Martian surface at SOLEIL synchrotron under X-ray irradiations

Arnaud Buch
  • Fonction : Auteur
  • PersonId : 1043635

Résumé

The Sample Analysis at Mars (SAM) instrument onboard NASA Curiosity rover revealed organic matter indigenous to a Martian sample with the detection of chlorohydrocarbons [1]. These molecules are thought to originate from a reaction of unidentified higher molecular mass organic matter with Martian perchlorates. The reaction may occur at Mars’ near-surface induced by the harsh radiative environment, e.g. direct radiation (UV, high energy X- and γ-rays) and secondary photons produced by the interaction of direct radiations with the martian regolith (low energy secondary X-rays). To address the influence of high energy X-rays directly reaching Mars surface on the degradation of organic molecules, a synchrotron session was undertaken on the PSICHE beam line. The reactivity and chemical characterization of L-alanine and benzoic acid exposed to hard X-rays (25-50 keV) did not show any degradation of organics nor formation of chlorohydrocarbons. In conclusion, the X-rays of the PSICHE beam line may have been too energetic for degrading efficiently organic molecules [3, 4]. This why we have investigate the impact of soft X-ray irradiation on the LUCIA beam line at SOLEIL at the 2.6 kv energy which is the energy range for the majority of secondary emissions and monitoring the evolution of perchlorate Cl by X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS).
Fichier principal
Vignette du fichier
Abscicon 2022 Boulesteix David and Arnaud Buch Irradiation tests (1).pdf (793.62 Ko) Télécharger le fichier
Abscicon 2022 Boulesteix David and Arnaud Buch Irradiation tests.pdf (547.16 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04462906 , version 1 (19-02-2024)

Identifiants

  • HAL Id : hal-04462906 , version 1

Citer

David Boulesteix, Arnaud Buch. Interpretation of SAM results simulating the Martian surface at SOLEIL synchrotron under X-ray irradiations. Abscicon, May 2022, Atlanta, United States. ⟨hal-04462906⟩
5 Consultations
4 Téléchargements

Partager

Gmail Facebook X LinkedIn More