Browsing by Subject "X-RAY-FLUORESCENCE"

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  • Rothery, David A.; Massironi, Matteo; Alemanno, Giulia; Barraud, Oceane; Besse, Sebastien; Bott, Nicolas; Brunetto, Rosario; Bunce, Emma; Byrne, Paul; Capaccioni, Fabrizio; Capria, Maria Teresa; Carli, Cristian; Charlier, Bernard; Cornet, Thomas; Cremonese, Gabriele; D'Amore, Mario; De Sanctis, M. Cristina; Doressoundiram, Alain; Ferranti, Luigi; Filacchione, Gianrico; Galluzzi, Valentina; Giacomini, Lorenza; Grande, Manuel; Guzzetta, Laura G.; Helbert, Joern; Heyner, Daniel; Hiesinger, Harald; Hussmann, Hauke; Hyodo, Ryuku; Kohout, Tomas; Kozyrev, Alexander; Litvak, Maxim; Lucchetti, Alice; Malakhov, Alexey; Malliband, Christopher; Mancinelli, Paolo; Martikainen, Julia; Martindale, Adrian; Maturilli, Alessandro; Milillo, Anna; Mitrofanov, Igor; Mokrousov, Maxim; Morlok, Andreas; Muinonen, Karri; Namur, Olivier; Owens, Alan; Nittler, Larry R.; Oliveira, Joana S.; Palumbo, Pasquale; Pajola, Maurizio; Pegg, David L.; Penttilä, Antti; Politi, Romolo; Quarati, Francesco; Re, Cristina; Sanin, Anton; Schulz, Rita; Stangarone, Claudia; Stojic, Aleksandra; Tretiyakov, Vladislav; Vaisanen, Timo; Varatharajan, Indhu; Weber, Iris; Wright, Jack; Wurz, Peter; Zambon, Francesca (2020)
    BepiColombo has a larger and in many ways more capable suite of instruments relevant for determination of the topographic, physical, chemical and mineralogical properties of Mercury's surface than the suite carried by NASA's MESSENGER spacecraft. Moreover, BepiColombo's data rate is substantially higher. This equips it to confirm, elaborate upon, and go beyond many of MESSENGER's remarkable achievements. Furthermore, the geometry of BepiColombo's orbital science campaign, beginning in 2026, will enable it to make uniformly resolved observations of both northern and southern hemispheres. This will offer more detailed and complete imaging and topographic mapping, element mapping with better sensitivity and improved spatial resolution, and totally new mineralogical mapping. We discuss MESSENGER data in the context of preparing for BepiColombo, and describe the contributions that we expect BepiColombo to make towards increased knowledge and understanding of Mercury's surface and its composition. Much current work, including analysis of analogue materials, is directed towards better preparing ourselves to understand what BepiColombo might reveal. Some of MESSENGER's more remarkable observations were obtained under unique or extreme conditions. BepiColombo should be able to confirm the validity of these observations and reveal the extent to which they are representative of the planet as a whole. It will also make new observations to clarify geological processes governing and reflecting crustal origin and evolution. We anticipate that the insights gained into Mercury's geological history and its current space weathering environment will enable us to better understand the relationships of surface chemistry, morphologies and structures with the composition of crustal types, including the nature and mobility of volatile species. This will enable estimation of the composition of the mantle from which the crust was derived, and lead to tighter constraints on models for Mercury's origin including the nature and original heliocentric distance of the material from which it formed.
  • Castro, Kepa; Knuutinen, Ulla; Fdez-Ortiz de Vallejuelo, Silvia; Maguregui, Maite; Manuel Madariaga, Juan; Laakso, Raili (2016)
    The paint stratigraphy of the two clock faces from the tower clock of the Government Palace in Helsinki (Finland) was analysed in order to determine their original colour before restoration works. Paint cross-section samples from both clock faces were analysed by confocal Raman microscopy and scanning electron microscopy coupled to an energy dispersive X-ray spectrometer (SEM-EDS). The results revealed the complex superimposition of paint layers applied over the original black colour. FTIR/ATR analyses proved that the original paint was prepared with linseed oil-resin media. Most likely not all of the different layer colours were visible. Some of the layers were likely to have been a primer or for rust protection.