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Characterization of Hydrogen in Basaltic Materials With Laser-Induced Breakdown Spectroscopy (LIBS) for Application to MSL ChemCam Data

Thomas, N. H. and Ehlmann, B. L. and Anderson, D. E. and Clegg, S. M. and Forni, O. and Schröder, Susanne and Rapin, W. and Meslin, P.-Y. and Lasue, J. and Delapp, D. M. and Dyar, M. D. and Gasnault, O. and Wiens, R. C. and Maurice, S. (2018) Characterization of Hydrogen in Basaltic Materials With Laser-Induced Breakdown Spectroscopy (LIBS) for Application to MSL ChemCam Data. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 123, pp. 1996-2021. Wiley. DOI: 10.1029/2017JE005467 ISSN 2169-9097

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Official URL: http://dx.doi.org/10.1029/2017JE005467

Abstract

The Mars Science Laboratory rover, Curiosity, is equipped with ChemCam, a laser‐induced breakdown spectroscopy (LIBS) instrument, to determine the elemental composition of nearby targets quickly and remotely. We use a laboratory sample set including prepared mixtures of basalt with systematic variation in hydrated mineral content and compositionally well‐characterized, altered basaltic volcanic rocks to measure hydrogen by characterizing the H‐alpha emission line in LIBS spectra under Martian environmental conditions. The H contents of all samples were independently measured using thermogravimetric analysis. We found that H peak area increases with weight percent H for our laboratory mixtures with basaltic matrices. The increase is linear with weight percent H in the mixtures with structurally bound H up to about 1.25 wt.% H and then steepens for higher H‐content samples, a nonlinear trend not previously reported but potentially important for characterizing high water content materials. To compensate for instrument, environmental, and target matrix‐related effects on quantification of H content from the LIBS signal, we examined multiple normalization methods. The best performing methods utilize O 778‐ and C 248‐nm emission lines. The methods return comparable results when applied to ChemCam data of H‐bearing materials on Mars. The calibration and normalization methods tested here will aid in investigations of H by LIBS on Mars with ChemCam and SuperCam. Further laboratory work will aid quantification across different physical matrices and heterogeneous textures because of differences we observed in H in pelletized and natural rock samples of the same composition.

Item URL in elib:https://elib.dlr.de/123346/
Document Type:Article
Title:Characterization of Hydrogen in Basaltic Materials With Laser-Induced Breakdown Spectroscopy (LIBS) for Application to MSL ChemCam Data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Thomas, N. H.UNSPECIFIEDUNSPECIFIED
Ehlmann, B. L.UNSPECIFIEDUNSPECIFIED
Anderson, D. E.UNSPECIFIEDUNSPECIFIED
Clegg, S. M.UNSPECIFIEDUNSPECIFIED
Forni, O.UNSPECIFIEDUNSPECIFIED
Schröder, SusanneSusanne.Schroeder (at) dlr.deUNSPECIFIED
Rapin, W.UNSPECIFIEDUNSPECIFIED
Meslin, P.-Y.UNSPECIFIEDUNSPECIFIED
Lasue, J.UNSPECIFIEDUNSPECIFIED
Delapp, D. M.UNSPECIFIEDUNSPECIFIED
Dyar, M. D.UNSPECIFIEDUNSPECIFIED
Gasnault, O.UNSPECIFIEDUNSPECIFIED
Wiens, R. C.UNSPECIFIEDUNSPECIFIED
Maurice, S.UNSPECIFIEDUNSPECIFIED
Date:2018
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:123
DOI :10.1029/2017JE005467
Page Range:pp. 1996-2021
Publisher:Wiley
ISSN:2169-9097
Status:Published
Keywords:LIBS spectroscopy, hydrogen, Mars Science Laboratory, thermogravimetric analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben OptoRob, R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Institute of Optical Sensor Systems
Deposited By: Schröder, Susanne
Deposited On:21 Nov 2018 10:25
Last Modified:21 Nov 2018 10:25

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