Pulsed laser-induced heating of mineral phases: Implications for Laser-Induced Breakdown Spectroscopy combined with Raman spectroscopy - Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie Accéder directement au contenu
Article Dans Une Revue Spectrochimica Acta Part B: Atomic Spectroscopy Année : 2019

Pulsed laser-induced heating of mineral phases: Implications for Laser-Induced Breakdown Spectroscopy combined with Raman spectroscopy

Amaury Fau
  • Fonction : Auteur
Agnes Cousin
Roger C. Wiens
Philippe Rosier
  • Fonction : Auteur
Yiuri Garino

Résumé

Laser-induced breakdown spectroscopy (LIBS) and Raman spectroscopy are complementary techniques providing respectively chemical and structural information on the sample target. These techniques are increasingly used in Earth and Planetary sciences, and often together. LIBS is locally destructive for the target, and the laser-induced effects due to LIBS laser shots on the structure and on the Raman fingerprint of a set of geological samples relevant to Mars exploration are here investigated by Raman spectroscopy and electron microscopy. Experiments show that the structure of samples with low optical absorption coefficients is preserved as well as the structural information carried by Raman spectra. By contrast, minerals with high optical absorption coefficient can be severely affected by LIBS laser shots with local amorphization, melting and/or phase transformation. Thermal modeling shows that the temperature can reach several thousands of degrees at the surface for such samples during a LIBS laser shot, but decreases rapidly with time and in space. In 2020, NASA Mars 2020 mission will send a rover equiped with a combined LIBS/Raman instrument for remote analysis (SuperCam) as well as proximity science instruments at fine scale for X-ray fluorescence called PIXL for Planetary Instrument for X-ray Lithochemistry, and deep UV Raman spectroscopy called SHERLOC for Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals. We discuss the implications of our results for the operation of these instruments and show that (i) the SuperCam analytical footprint for Raman spectroscopy is many times larger than the LIBS crater, minimizing any effects and (ii) SHERLOC and PIXL analysis may be affected if they analyze within a LIBS crater created by SuperCam LIBS.
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Dates et versions

hal-02273480 , version 1 (29-08-2019)

Identifiants

Citer

Amaury Fau, Olivier Beyssac, Michel Gauthier, P-Y. Meslin, Agnes Cousin, et al.. Pulsed laser-induced heating of mineral phases: Implications for Laser-Induced Breakdown Spectroscopy combined with Raman spectroscopy. Spectrochimica Acta Part B: Atomic Spectroscopy, 2019, ⟨10.1016/j.sab.2019.105687⟩. ⟨hal-02273480⟩
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