No full text
Unpublished conference/Abstract (Scientific congresses and symposiums)
Biogeological analysis of analogues samples using portable and confocal Raman spectrometers in preparation for Mars missions
Malherbe, Cédric; Demaret, Lucas; Hutchinson, Ian et al.
2018XIII International Conference GeoRaman
 

Files


Full Text
No document available.

Send to



Details



Keywords :
Raman; Bio-geological samples; ExoMars
Abstract :
[en] In 2020, Raman spectrometers will be deployed on Mars to study the composition of the surface when the ExoMars (ESA/Roscosmos) and the Mars 2020 (NASA) rovers will be launched. For the first time, samples recovered from up to 2 meters down the surface of Mars will be interrogated with the ExoMars drill. Raman spectrometers have the capability to detect geological substances constituting the rocky surface of Mars (inorganic molecules and inorganic molecular ions). The nature of rocks on the surface of Mars will provide information about the habitability of the planet. In addition, Raman instruments have the ability to detect potential biological-derivative substances, often referred to as biomarkers (organic molecules originating from extent or extinct living organisms). In preparation for ExoMars, studying the detection capability of miniaturized Raman spectrometers is essential, in particular for instruments developed for space missions (compromised by the associated challenging constraints such as minimal power budget, mass budget, data budget and overall envelope). We present a comparison of the capability of a number of Raman spectrometer configurations to characterize a selection of 3 samples recognized as terrestrial analogue samples for the surface of Mars: (a) desert varnish samples, which are mineral coatings often associated with living organisms in many stable extreme environments on Earth; (b) benthic gypsum crusts colonized by microorganisms, which excrete some photo-protective pigment such as carotenoids; and (c) fossilized carbonaceous fumarole, which inner part is covered with iron oxide and colonized by microorganisms. In particular, we will compare spectral data recorded with benchtop instruments and miniaturized spectrometers with operating modes similar to the future ExoMars Raman Laser Spectrometer. We will discuss important instrumental parameters such as the excitation wavelength, the number of spectra recorded per sample and selection of optimal operating modes, in particular in the context of the detection of biomarkers dispersed within a specific geological matrix.
Disciplines :
Chemistry
Author, co-author :
Malherbe, Cédric ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique inorganique
Demaret, Lucas ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique inorganique
Hutchinson, Ian;  University of Leicester > Physics and Astronomy
Ingley, Richard;  University of Leicester > Physics and Astronomy
Edwards, Howell;  University of Leicester > Physics and Astronomy
Eppe, Gauthier  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique inorganique
Language :
English
Title :
Biogeological analysis of analogues samples using portable and confocal Raman spectrometers in preparation for Mars missions
Publication date :
11 June 2018
Event name :
XIII International Conference GeoRaman
Event date :
du 10 au 14 juin 2018
Audience :
International
Available on ORBi :
since 27 August 2018

Statistics


Number of views
96 (4 by ULiège)
Number of downloads
0 (0 by ULiège)

Bibliography


Similar publications



Contact ORBi