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Quantification of water content by laser induced breakdown spectroscopy on Mars

Rapin, William and Meslin, Pierre-Yves and Maurice, Sylvestre and Wiens, Roger C. and Laporte, Didier and Chauviré, Boris and Gasnault, Olivier and Schröder, Susanne and Beck, Pierre and Bender, Steven C and Beyssac, Olivier and Cousin, Agnès and Dehouck, Erwin and Drouet, Christophe and Forni, Olivier and Nachon, Marion and Melikechi, Noureddine and Rondeau, Benjamin and Mangold, Nicholas and Thomas, Nathalie Quantification of water content by laser induced breakdown spectroscopy on Mars. (2017) Spectrochimica Acta Part B: Atomic Spectroscopy, 130. 82-100. ISSN 0584-8547

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Official URL: https://doi.org/10.1016/j.sab.2017.02.007

Abstract

Laser induced breakdown spectroscopy (LIBS), as performed by the ChemCam instrument, provides a new technique to measure hydrogen at the surface of Mars. Using a laboratory replica of the LIBS instrument onboard the Curiosity rover, different types of hydrated samples (basalts, calcium and magnesium sulfates, opals and apatites) covering a range of targets observed on Mars have been characterized and analyzed. A number of factors related to laser parameters, atmospheric conditions and differences in targets properties can affect the standoff LIBS signal, and in particular the hydrogen emission peak. Dedicated laboratory tests were run to identify a normalization of the hydrogen signal which could best compensate for these effects and enable the application of the laboratory calibration to Mars data. We check that the hydrogen signal increases linearly with water content; and normalization of the hydrogen emission peak using to oxygen and carbon emission peaks (related to the breakdown of atmospheric carbon dioxide) constitutes a robust approach. Moreover, the calibration curve obtained is relatively independent of the samples types

Item Type:Article
HAL Id:hal-01636031
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited By: Yves MOMBOISSE
Deposited On:04 Dec 2019 14:56

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