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| Titel |
Miniature LIMS system designed for sensitive in situ measurements of organic deposits in materials on solar system objects |
| VerfasserIn |
Andreas Riedo, Pavel Moreno-Garcia, Valentine Grimaudo, Maike Brigitte Neuland, Marek Tulej, Peter Broekmann, Peter Wurz |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250095695
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| Publikation (Nr.) |
 EGU/EGU2014-11164.pdf |
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| Zusammenfassung |
| In situ investigation of chemical composition is of considerable interest for application in
planetary missions. The possibility of bio-relevant organic chemistry on the surfaces of
comets and primitive asteroids is one of the most intriguing problems of the current
astrobiology. Rock-water interface existed in early small solar body history, in addition to
extensive mineralogical modifications of the surface could have initiated also a rich organic
and bio-organic chemistry [1].
Current space instrumentation designed for molecular detection use thermal evaporation
source combined with gas chromatography (GC) and mass spectrometry [2]. Hence, it is
capable of collecting data of the volatile fraction of the investigated sample. Laser desorption
mass spectrometry (LD-MS) is another method for molecule detection capable of
vaporisation and ionisation of molecules present on a solid substrate surface, e.g.
a rock. A miniature laser ablation ionisation reflectron-type time-of-flight mass
analyser (LMS) developed by our group for in situ measurements of the elemental,
isotopic composition can be used also for sensitive analyses of chemical compounds
present on solid surfaces with high spatial resolution [3-6]. Comparing to laser
ablation laser desorption analyses are conducted at laser irradiance reduced by
approximately 103–104 times. In laser ablation mode, the LMS system offers high
dynamic range of at least eight orders of magnitude and allows for the detection in the
ppb range for metallic- and non-metallic elements. Instrument mass resolution
m/Δm is about 800 at the 56Fe mass peak when the instrument is used in ablation
mode. The mass resolution is increased to m/Δm >1000 when desorption studies are
conducted (at ~600 m/q). We will demonstrate the instrument performance conducting
molecular desorption studies of different species, e.g. organic, biotic and abiotic. Laser
ablation/ionisation studies are conducted in parallel to complement the laser desorption
analyses.
References
1)S. Pizzarello, Y. Huang, M.R. Alexandre, “Molecular asymmetry in extraterrestrial
chemistry: insights from a pristine meteorite”, PNAS, 2008, 105, pp. 3700 – 3704.
2)L. A. Leshin et al., Volatile, isotope, and organic analysis of Martian fines with the Mars
Curiosity rover, Science, 2013, 341, 1238937, pp. 1 – 9.
3)A. Riedo, M. Neuland, S. Meyer, M. Tulej, and P. Wurz, “Coupling of LMS with a fs-laser
ablation ion source: elemental and isotope composition measurements”, J. Anal. At.
Spectrom., 2013, 28, pp. 1256 – 1269.
4)A. Riedo, S. Meyer, B. Heredia, M.B. Neuland, A. Bieler, M. Tulej, I. Leya, M. Iakovleva,
K. Mezger, and P. Wurz, “Highly accurate isotope composition measurements by a miniature
laser ablation mass spectrometer designed for in situ investigations on planetary surfaces”,
Planet. Space Sci., 2013, 87, pp. 1 – 13.
5)A. Riedo, P. Wahlström, J.A. Scheer, P. Wurz, and M. Tulej, “Effect of long duration UV
irradiation on diamondlike carbon surfaces in the presence of a hydrocarbon gaseous
atmosphere”, J. Appl. Phys., 2010, 108, 114915, pp.1 – 8.
6)M. Tulej, M. Iakovleva, I. Leya, and P. Wurz, “A miniature mass analyser for in-situ
elemental analysis of planetary material – performance studies”, Anal. Bioanal. Chem., 2011,
399, pp. 2185 – 2200. |
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