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

Here, 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 willmore » 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.« less
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [4] ; ORCiD logo [1] ; ORCiD logo [3] ; ORCiD logo [3] ; ORCiD logo [2] ; ORCiD logo [5] ; ORCiD logo [3] ; ORCiD logo [2] ;  [3]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. de Toulouse, Toulouse (France)
  4. Univ. de Toulouse, Toulouse (France); German Aerospace Center (DLR), Berlin (Germany)
  5. Mount Holyoke College, South Hadley, MA (United States)
Publication Date:
Report Number(s):
LA-UR-18-28849
Journal ID: ISSN 2169-9097
Grant/Contract Number:
89233218CNA000001
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Planets
Additional Journal Information:
Journal Volume: 123; Journal Issue: 8; Journal ID: ISSN 2169-9097
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Aeronautic and Space Administration (NASA); USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences; LIBS spectroscopy; hydrogen; Mars Science Laboratory; thermogravimetric analysis
OSTI Identifier:
1484668

Thomas, N. H., Ehlmann, Bethany L., Anderson, D. E., Clegg, Samuel M., Forni, O., Schröder, S., Rapin, W., Meslin, P. -Y., Lasue, J., Delapp, Dorothea Marcia, Dyar, M. D., Gasnault, Olivier, Wiens, Roger Craig, and Maurice, Sylvestre. Characterization of Hydrogen in Basaltic Materials With Laser-Induced Breakdown Spectroscopy (LIBS) for Application to MSL ChemCam Data. United States: N. p., Web. doi:10.1029/2017JE005467.
Thomas, N. H., Ehlmann, Bethany L., Anderson, D. E., Clegg, Samuel M., Forni, O., Schröder, S., Rapin, W., Meslin, P. -Y., Lasue, J., Delapp, Dorothea Marcia, Dyar, M. D., Gasnault, Olivier, Wiens, Roger Craig, & Maurice, Sylvestre. Characterization of Hydrogen in Basaltic Materials With Laser-Induced Breakdown Spectroscopy (LIBS) for Application to MSL ChemCam Data. United States. doi:10.1029/2017JE005467.
Thomas, N. H., Ehlmann, Bethany L., Anderson, D. E., Clegg, Samuel M., Forni, O., Schröder, S., Rapin, W., Meslin, P. -Y., Lasue, J., Delapp, Dorothea Marcia, Dyar, M. D., Gasnault, Olivier, Wiens, Roger Craig, and Maurice, Sylvestre. 2018. "Characterization of Hydrogen in Basaltic Materials With Laser-Induced Breakdown Spectroscopy (LIBS) for Application to MSL ChemCam Data". United States. doi:10.1029/2017JE005467. https://www.osti.gov/servlets/purl/1484668.
@article{osti_1484668,
title = {Characterization of Hydrogen in Basaltic Materials With Laser-Induced Breakdown Spectroscopy (LIBS) for Application to MSL ChemCam Data},
author = {Thomas, N. H. and Ehlmann, Bethany L. and Anderson, D. E. and Clegg, Samuel M. and Forni, O. and Schröder, S. and Rapin, W. and Meslin, P. -Y. and Lasue, J. and Delapp, Dorothea Marcia and Dyar, M. D. and Gasnault, Olivier and Wiens, Roger Craig and Maurice, Sylvestre},
abstractNote = {Here, 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.},
doi = {10.1029/2017JE005467},
journal = {Journal of Geophysical Research. Planets},
number = 8,
volume = 123,
place = {United States},
year = {2018},
month = {7}
}

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