Bonn 2010 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 8: Planets and Small Bodies I

EP 8.8: Vortrag

Dienstag, 16. März 2010, 18:30–18:45, AKM

Mössbauer Spectrometer MIMOS II on the Russian Mission Phobos-Grunt — Mathias Blumers and •Jasmin Maul — Johannes Gutenberg Universität, Mainz, RLP

Mössbauer spectroscopy is a powerful tool for quantitative mineralogical analysis of Fe-bearing materials. The scientific objectives of the Mössbauer investigation are to obtain the mineralogical identification of iron-bearing phases, the quantitative measurement of the distribution of iron among these iron-bearing phases and the quantitative measurement of the distribution of iron among its oxidation states. Two Miniaturized Mössbauer Spectrometers MIMOS II on board of the two Mars Exploration Rovers are still operational after almost 6 years of work. The MER mission has proven that Mössbauer spectroscopy is an important tool for the in situ exploration of extraterrestrial bodies, in particular the study of Fe-bearing samples. MIMOS II is part of the Russian Phobos-Grunt mission which is now scheduled to launch the end of 2011. One of the main goals of the mission is to study physical and chemical properties of the surface of the Martian moon Phobos in situ and under laboratory conditions to address questions related to primordial matter of the Solar system, and the origin of terrestrial planets. The Mössbauer Spectrometer MIMOS II for Phobos-Grunt is based on the MER version with some modifications and improvements (e.g. optimized radiation shielding of detector system). The total mass of the instrument including the electronics board is < 600g. Like on MER, MIMOS II is mounted on a robotic arm.