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Contribution of a martian atmosphere to laser-induced breakdown spectroscopy (LIBS) data and testing its emission characteristics for normalization applications

Schröder, Susanne and Rammelkamp, Kristin and Vogt, David and Gasnault, Olivier and Hübers, Heinz-Wilhelm (2019) Contribution of a martian atmosphere to laser-induced breakdown spectroscopy (LIBS) data and testing its emission characteristics for normalization applications. Icarus: International Journal of Solar System Studies, 325, pp. 1-15. Elsevier. DOI: 10.1016/j.icarus.2019.02.017 ISSN 0019-1035

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Official URL: http://dx.doi.org/10.1016/j.icarus.2019.02.017

Abstract

For in-situ geochemical analysis of the surface of Mars, laser-induced breakdown spectroscopy (LIBS) is a very useful technique and the first extraterrestrial LIBS instrument ChemCam will soon be followed by others. Appropriate normalization of real mission data that is taken under varying experimental and environmental conditions from diverse geologic samples is an ongoing topic. One approach is the scaling to emission line intensities of carbon and oxygen from the CO2 -dominated low-pressure martian atmosphere as an internal standard. Here, we performed several experiments to examine the emission of carbon and oxygen from a simulated martian atmosphere on simple, mostly mono-elemental samples, and to compare the emission characteristics of the elements of both origins. Differences in laser irradiance were found to have the biggest impact on sample emission lines scaled to C and O emission of the atmosphere. The temporal behavior shown in time-resolved LIBS measurements is dominated by the degree of ionization, but the ratio of the neutral emission from the sample to neutral emission from the atmosphere also varies over time. The effect of different grain sizes was minor in comparison to the high intrinsic variation in the LIBS data. Different samples were found to affect the absolute intensity of atmospheric C(I) more than O(I). Furthermore, the C(I) emission was found to be inseparably superimposed by iron if the latter was present in the target. The results indicate limitations of the general suitability of atmospheric carbon and oxygen emission for normalization purposes of martian LIBS data.

Item URL in elib:https://elib.dlr.de/128398/
Document Type:Article
Title:Contribution of a martian atmosphere to laser-induced breakdown spectroscopy (LIBS) data and testing its emission characteristics for normalization applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröder, SusanneSusanne.Schroeder (at) dlr.deUNSPECIFIED
Rammelkamp, KristinKristin.Rammelkamp (at) dlr.deUNSPECIFIED
Vogt, DavidDavid.Vogt (at) dlr.deUNSPECIFIED
Gasnault, Olivierinstitut de recherche en astrophysique et planétologie, université paul sabatier, toulouse, franceUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:325
DOI :10.1016/j.icarus.2019.02.017
Page Range:pp. 1-15
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Mars surface; Spectroscopy; Experimental techniques; Mineralogy; Mars atmosphere
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems, R - Vorhaben OptoRob
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Schröder, Susanne
Deposited On:12 Jul 2019 10:15
Last Modified:12 Jul 2019 10:15

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