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Effects of pulsed laser and plasma interaction on Fe, Ni, Ti, and their oxides for LIBS Raman analysis in extraterrestrial environments

Schröder, Susanne and Rammelkamp, Kristin and Hanke, Franziska and Weber, Iris and Vogt, David Sebastian and Frohmann, Sven and Kubitza, Simon and Böttger, Ute and Hübers, Heinz‐Wilhelm (2019) Effects of pulsed laser and plasma interaction on Fe, Ni, Ti, and their oxides for LIBS Raman analysis in extraterrestrial environments. Journal of Raman Spectroscopy. Wiley. DOI: 10.1002/jrs.5650 ISSN 0377-0486

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Official URL: http://dx.doi.org/10.1002/jrs.5650

Abstract

Laser‐induced breakdown spectroscopy (LIBS) and Raman spectroscopy have a high potential for in situ geochemical and mineralogical analyses for planetary exploration, in particular in combination. The SuperCam instrument onboard NASA's Mars 2020 rover will use both techniques together on another planet for the first time. The high‐power pulsed LIBS laser ablates material, and a small luminous plasma is produced for spectral analysis. The laser–matter interaction and the plasma shock wave can alter the sample surface, and new molecules can be produced, which deposit close to the LIBS ablation crater. Subsequent Raman analysis might then not sample the original structure. Here, we investigated pure metals (Fe, Ni, and Ti), the iron‐containing oxides hematite and ilmenite, and a fragment of the Gibeon meteorite in terrestrial ambient conditions, in simulated Martian atmospheric conditions, and in vacuum. LIBS ablation craters and their close proximity were studied with subsequent Raman analysis. Our analysis shows that Earth and Mars atmosphere provide enough oxygen in the LIBS plasma to produce oxides with metals from the sample. These can then be observed in the Raman data. Also, carbon was seen in some of the Raman data from the sample after the LIBS measurement. On hematite, a reduction of the mineral, that is, the presence of magnetite, was observed inside the LIBS crater for terrestrial and Martian atmospheric conditions and in vacuum. For the analysis and correct interpretation of Raman data it is important to be aware that alteration could have occurred by a preceding LIBS measurement. Raman analysis of several positions close to the LIBS ablation crater can help to infer the original and a possibly altered structure.

Item URL in elib:https://elib.dlr.de/128890/
Document Type:Article
Title:Effects of pulsed laser and plasma interaction on Fe, Ni, Ti, and their oxides for LIBS Raman analysis in extraterrestrial environments
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröder, SusanneSusanne.Schroeder (at) dlr.deUNSPECIFIED
Rammelkamp, KristinKristin.Rammelkamp (at) dlr.deUNSPECIFIED
Hanke, FranziskaFranziska.Hanke (at) dlr.deUNSPECIFIED
Weber, IrisUNSPECIFIEDUNSPECIFIED
Vogt, David SebastianDavid.Vogt (at) dlr.deUNSPECIFIED
Frohmann, SvenSven.Frohmann (at) dlr.deUNSPECIFIED
Kubitza, SimonSimon.Kubitza (at) dlr.deUNSPECIFIED
Böttger, UteUte.Boettger (at) dlr.deUNSPECIFIED
Hübers, Heinz‐WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:Journal of Raman Spectroscopy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/jrs.5650
Publisher:Wiley
ISSN:0377-0486
Status:Published
Keywords:LIBS, Mars, metals and their oxides, Raman spectroscopy, simulated planetary conditions/environments, space missions
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:27 Aug 2019 08:28
Last Modified:27 Aug 2019 08:28

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