Miniaturized Mossbauer spectrometer MIMOS

Adjustable Workbench (PAW) instrument assembly. The SH shown in Figs. 3.15 and 3.16 contains the electromechanical transducer (mounted in the center), the main and reference Co/Rh sources, multilayered radiation shields, detectors and their preamplifiers and main (linear) amplifiers, and a contact plate and sensor. The contact plate and contact sensor are used in conjunction with the IDD to apply a small preload when it places the SH holding it firmly against the target. The electronics board contains power supplies/conditioners, the dedicated CPU, different kinds of memory, firmware, and associated circuitry for instrument control and data processing. The SH of the miniaturized Mossbauer spectrometer MIMOS II has the dimensions (5 x 5.5 x 9.5) cm and weighs only ca. 400 g. Both 14.4 keV y-rays and 6.4 keV Fe X-rays are detected simultaneously by four Si-PIN diodes. The mass of the electronics board is about 90 g [36],... 

The miniaturized Mossbauer spectrometer MIMOS II has been used already in several terrestrial applications which would not have been possible before. A number of other possible terrestrial applications, for example, in the field, in industry, and fundamental research, are under consideration. With the new generation of the Mossbauer spectrometer MIMOS 11, the method itself can be applied to numerous new fields in research, environmental science, planetary science, and many other fields. Because of this reason, Mossbauer spectroscopy may become a more widely used method than it is today. 

Fig. 2.44 The sensor head of the miniaturized Mossbauer spectrometer MIMOS contains the drive (vibrating) unit, the Mossbauer source, the detectors and amplification electronics. MIMOS is set up in backscattering geometry [77, 78]...

P.A. de Souza Jr, B. Bernhardt, G. Klingelhofer, P. Giitlich, Surface analysis in archaeology using the miniaturized Mossbauer spectrometer MIMOS II. Hyperfine Interact. 151,125-130... 

M. Blumers, B. Bernhardt, P. Lechner, G. KUngeUidfer, C. d Uston, H. Soltau, L. Striider, R. Eckhardt, J. Bruckner, H. Henkel, J.G. Lopez, J. Maul, The miniaturized Mossbauer spectrometer MIMOS IIA Increased sensitivity and new capability for elemental analysis. Nucl. Instrum. Methods Phys. Res. A 624, 277-281 (2010)... 

Iron is one of the most abundant elements in the universe. Mossbauer (MB) spectroscopy is an established laboratory technique and a powerful tool to study Fe-bearing substances. The surface of Mars is Fe-rich compared to Earth, and a miniaturized MB spectrometer (MIMOS II) was developed for its robotic exploration as part of NASA s Mars Exploration Rover (MER) mission (Klingelhofer et al. 2003). 

CEMS = conversion electron Mossbauer spectroscopy DFT = density functional theory EFG = electric field gradient EPR = electron paramagnetic resonance ESEEM = electron spin echo envelope modulation spectroscopy GTO = Gaussian-type orbitals hTH = human tyrosine hydroxylase MIMOS = miniaturized mossbauer spectrometer NFS = nuclear forward scattering NMR = nuclear magnetic resonance RFQ = rapid freeze quench SAM = S -adenosyl-L-methionine SCC = self-consistent charge STOs = slater-type orbitals TMP = tetramesitylporphyrin XAS = X-ray absorption spectroscopy. 

The instrument MIMOS 11 is extremely miniaturized compared to standard laboratory Mossbauer spectrometers and is optimized for low power consumption and high detection efficiency (see Sect. 3.3) and [326, 327, 336-339]. All components were selected to withstand high acceleration forces and shocks, temperature variations over the Martian diurnal cycle, and cosmic ray irradiation. Mossbauer measurements can be done during day and night covering the whole diurnal temperature... 

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