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Quantification of MnO using the ChemCam LIBS Instrument and Comparison with the Alpha-Particle X-ray Spectrometer

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dc.contributor.advisor Gellert, Ralf
dc.contributor.author Wilhelm, Brent
dc.date.accessioned 2019-12-20T15:53:49Z
dc.date.available 2019-12-20T15:53:49Z
dc.date.copyright 2019-12
dc.date.created 2019-12-13
dc.date.issued 2019-12-20
dc.identifier.uri http://hdl.handle.net/10214/17673
dc.description.abstract Manganese oxide (MnO) values exceeding 50 wt% have been reported by the ChemCam (CCAM) laser-induced breakdown spectroscopy (LIBS) instrument onboard the Mars rover: Curiosity. These observations have raised speculation on the habitability of the early Mars environment. This work recreates the univariate calibration used for the quantification of MnO using CCAM spectra, and provides a novel comparison to the Alpha-Particle X-ray Spectrometer (APXS) also on-board Curiosity. Between instruments, systematic deviations of MnO values are found for groups of targets with a characteristic chemical and physical matrix. A multivariate calibration is introduced, which accounts for the relative abundance of SiO2, TiO2, Al2O3, FeO, MgO, CaO, Na2O, and K2O in the sample. The multivariate method corrects for impacts of the normalization to the manganese signal as well as chemical matrix effects, which reduces the MnO prediction error by a factor of >3.5 and agrees more favourably with the APXS in general. en_US
dc.language.iso en en_US
dc.subject LIBS en_US
dc.subject ChemCam en_US
dc.subject CCAM en_US
dc.subject APXS en_US
dc.subject MSL en_US
dc.subject Mars en_US
dc.title Quantification of MnO using the ChemCam LIBS Instrument and Comparison with the Alpha-Particle X-ray Spectrometer en_US
dc.type Thesis en_US
dc.degree.programme Physics en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Physics en_US
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