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Laser induced breakdown spectroscopy on soils and rocks: Influence of the sample temperature, moisture and roughness

Rauschenbach, I. and Lazic, V. and Pavlov, S.G. and Hübers, H.-W. and Jessberger, E.K. (2008) Laser induced breakdown spectroscopy on soils and rocks: Influence of the sample temperature, moisture and roughness. Spectrochimica Acta Part B: Atomic Spectroscopy, 63 (10), pp. 1205-1212. Elsevier B.V.. DOI: 10.1016/j.sab.2008.08.006.

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Abstract

ExoMars, ESA´s next mission to Mars, will include a combined Raman/LIBS instrument for the comprehensive in-situ mineralogical and elemental analyses of Martian rocks and soils. It is inferred that water exists in the upper Martian surface as ice layers, “crystal” water or adsorbed pore water. Thus, we studied Laser Induced Breakdown Spectroscopy (LIBS) on wet and dry rocks under Martian environmental conditions in the temperature range -60°C to +20°C and in two pressure regimes, above and below the water triple point. Above this point, the LIBS signals from the rock forming elements have local minima that are accompanied by hydrogen (water) emission maxima at certain temperatures that we associate with phase transitions of free or confined water/ice. At these sample temperatures, the plasma electron density and its temperature are slightly lowered. In contrast to powder samples, a general increase of the electron density upon cooling was observed on rock samples. By comparing the LIBS signal behavior from the same rock with different grades of polishing, and different rocks with the same surface treatment, it was possible to distinguish between the influence of surface roughness and the bulk material structure (pores and grains). Below the triple point of water, the LIBS signal from the major sample elements is almost independent of the sample temperature. However, at both considered pressures we observed a hydrogen emission peak close to -50°C, which is attributed to a phase transition of supercooled water trapped inside bulk pores.

Document Type:Article
Title:Laser induced breakdown spectroscopy on soils and rocks: Influence of the sample temperature, moisture and roughness
Authors:
AuthorsInstitution or Email of Authors
Rauschenbach, I.Institut für Planetologie, Westfälische Wilhelms-Universität, Münster, Germany
Lazic, V.ENEA, FIS-LAS, Frascati (RM), Italy
Pavlov, S.G.UNSPECIFIED
Hübers, H.-W.UNSPECIFIED
Jessberger, E.K.nstitut für Planetologie, Westfälische Wilhelms-Universität, Münster, Germany
Date:October 2008
Journal or Publication Title:Spectrochimica Acta Part B: Atomic Spectroscopy
Volume:63
DOI:10.1016/j.sab.2008.08.006
Page Range:pp. 1205-1212
Publisher:Elsevier B.V.
Status:Published
Keywords:LIBS, soils, supercooled water, temperature, Mars
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Insitu Science (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr. Sergey Pavlov
Deposited On:06 Jan 2010 21:13
Last Modified:12 Dec 2013 20:42

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