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Molecular emission in laser-induced breakdown spectroscopy: An investigation of its suitability for chlorine quantification on Mars

Vogt, David and Rammelkamp, Kristin and Schröder, Susanne and Hübers, Heinz-Wilhelm (2017) Molecular emission in laser-induced breakdown spectroscopy: An investigation of its suitability for chlorine quantification on Mars. Icarus (302), pp. 470-482. Elsevier. DOI: 10.1016/j.icarus.2017.12.006 ISSN 0019-1035

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Official URL: https://www.sciencedirect.com/science/article/pii/S0019103517305389

Abstract

The intensity of the molecular CaCl emission in LIBS spectra is examined in order to evaluate its suitability for the detection of chlorine in a Martian environment. Various mixtures resembling Martian targets with varying Cl content are investigated under simulated Martian conditions. The reactions leading to the formation of CaCl are modeled based on reaction kinetics and are used to fit the measured CaCl band intensities. MgCl bands are also investigated as potential alternatives to CaCl, but no MgCl bands can be identified in samples containing both Mg and Cl. The study confirms that CaCl is well suited for the indirect detection of chlorine, but finds a strong dependence on the concentrations of Ca and Cl in the sample. Spectra from samples with a high chlorine concentration can have low-intensity CaCl emission due to a deficiency of Ca. A qualitative estimate of the sample composition is possible based on the ratio of the band intensity of CaCl to the intensity of Ca emission lines. Time-resolved measurements show that the CaCl concentration in the plasma is highest after about 1 µs.

Item URL in elib:https://elib.dlr.de/118533/
Document Type:Article
Title:Molecular emission in laser-induced breakdown spectroscopy: An investigation of its suitability for chlorine quantification on Mars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Vogt, DavidDavid.Vogt (at) dlr.deUNSPECIFIED
Rammelkamp, KristinKristin.Rammelkamp (at) dlr.deUNSPECIFIED
Schröder, Susannesusanne.schroeder (at) dlr.deUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:6 December 2017
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2017.12.006
Page Range:pp. 470-482
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:ChemCam, LIBS, Molecular LIBS, Chlor, Molekülbande, CaCl, Mars
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 Robotischer Wissenschafts-Explorer, R - Vorhaben Optische Sensorik - Theorie, Kalibration, Verifikation
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Vogt, David
Deposited On:30 Jan 2018 08:32
Last Modified:06 Sep 2019 15:26

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