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

Journal Article · · Journal of Geophysical Research. Planets
DOI:https://doi.org/10.1029/2017JE005467· OSTI ID:1484668
 [1];  [1];  [1];  [2];  [3];  [4];  [1];  [3];  [3];  [2];  [5];  [3];  [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)
+ Show Author Affiliations
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.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
NASA; USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1484668
Report Number(s):
LA-UR-18-28849
Journal Information:
Journal of Geophysical Research. Planets, Journal Name: Journal of Geophysical Research. Planets Journal Issue: 8 Vol. 123; ISSN 2169-9097
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

A comparative study on the color change of pigments due to the consolidation of conventional spectroscopic techniques and laser-induced breakdown spectroscopy journal July 2019
Mars Science Laboratory Observations of Chloride Salts in Gale Crater, Mars journal October 2019

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58 GEOSCIENCES
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