Multispace quantum interference in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>57</mml:mn></mml:msup></mml:math>Fe synchrotron Mössbauer source

Smirnov, G. V.; Chumakov, A. I.; Potapkin, V.; Rüffer, R.; Popov, S. L.

doi:10.1103/physreva.84.053851

Cited by 26 publications

(33 citation statements)

References 17 publications

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“…New advances in Mö ssbauer synchrotron technology have made it possible to obtain Mö ssbauer spectra in the energy domain with the aid of nuclear Bragg reflection, the so-called synchrotron Mö ssbauer source (Smirnov et al, 1997). This process leads to a slightly different source line shape, however, which because of the physics of the process is a normalized squared Lorentzian (Smirnov et al, 2011):…”

Section: Theorymentioning

confidence: 99%

MossA: a program for analyzing energy-domain Mössbauer spectra from conventional and synchrotron sources

2012

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The program MossA provides a straightforward approach to the fitting of 57 Fe conventional and synchrotron energy-domain Mö ssbauer spectra. Sites can be defined simply by mouse clicks and hyperfine parameters can be constrained to constant values, within specific ranges, and can be coupled linearly between different subspectra. The program includes a full transmission integral fit with Lorentzian line shape (conventional source) or Lorentzian-squared line shape (synchrotron source). The fitting process is graphically displayed in real time while fitting and can be interrupted at any time. Gaussian-shaped quadrupole splitting distributions for analyzing nonmagnetic amorphous materials are included. MossA is designed especially for the rapid and comprehensive analysis of complex Mö ssbauer spectra, made possible by its native graphical user input.

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Section: Theorymentioning

confidence: 99%

MossA: a program for analyzing energy-domain Mössbauer spectra from conventional and synchrotron sources

2012

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“…Under these conditions a particular case of hyperfine interaction is realised where magnetic dipole and electric quadrupole hyperfine interactions are strongly mixed (Smirnov, 2000). The combined multipath quantum interference in space, energy and spin domains results in the formation of a pseudo-singleline resonance structure in iron borate (Smirnov et al, 2011), which provides the basis for the creation of a single-line Synchrotron Mö ssbauer Source (SMS). The spectrum of the emitted radiation has an energy bandwidth close to the natural line width of the Mö ssbauer resonance.…”

Section: Introductionmentioning

confidence: 99%

The⁵⁷Fe Synchrotron Mössbauer Source at the ESRF

et al. 2012

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The design of a (57)Fe Synchrotron Mössbauer Source (SMS) for energy-domain Mössbauer spectroscopy using synchrotron radiation at the Nuclear Resonance beamline (ID18) at the European Synchrotron Radiation Facility is described. The SMS is based on a nuclear resonant monochromator employing pure nuclear reflections of an iron borate ((57)FeBO(3)) crystal. The source provides (57)Fe resonant radiation at 14.4 keV within a bandwidth of 15 neV which is tunable in energy over a range of about ±0.6 µeV. In contrast to radioactive sources, the beam of γ-radiation emitted by the SMS is almost fully resonant and fully polarized, has high brilliance and can be focused to a 10 µm × 5 µm spot size. Applications include, among others, the study of very small samples under extreme conditions, for example at ultrahigh pressure or combined high pressure and high temperature, and thin films under ultrahigh vacuum. The small cross section of the beam and its high intensity allow for rapid collection of Mössbauer data. For example, the measuring time of a spectrum for a sample in a diamond anvil cell at ∼100 GPa is around 10 min, whereas such an experiment with a radioactive point source would take more than one week and the data quality would be considerably less. The SMS is optimized for highest intensity and best energy resolution, which is achieved by collimation of the incident synchrotron radiation beam and thus illumination of the high-quality iron borate crystal within a narrow angular range around an optimal position of the rocking curve. The SMS is permanently located in an optics hutch and is operational immediately after moving it into the incident beam. The SMS is an in-line monochromator, i.e. the beam emitted by the SMS is directed almost exactly along the incident synchrotron radiation beam. Thus, the SMS can be easily utilized with all existing sample environments in the experimental hutches of the beamline. Owing to a very strong suppression of electronic scattering for pure nuclear reflections (∼10(-9)), SMS operation does not required any gating of the prompt electronic scattering. Thus, the SMS can be utilized in any mode of storage ring operation.

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“…Third-generation synchrotron sources offer a solution in the form of time-domain Mössbauer spectroscopy (that is, nuclear forward scattering); however, this method is not well suited to materials with a large number of components (such as FeAlPv) because of the resulting complex spectra. To solve this problem, we have developed an energydomain synchrotron Mössbauer source (SMS) that offers a number of advantages over conventional Mössbauer spectroscopy: high brilliance and a nearly fully resonant emitted beam that can be focused to a spot of only a few microns diameter, and in contrast to time-domain spectroscopy, spectra that deliver direct and unambiguous information 17,18 . Therefore, SMS spectroscopy allows for rapid measurement of energy-domain Mössbauer spectra under extreme conditions with a quality generally sufficient to unambiguously deconvolute even highly complex spectra.…”

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confidence: 99%

Effect of iron oxidation state on the electrical conductivity of the Earth’s lower mantle

et al. 2013

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Iron can adopt different spin states in the lower mantle. Previous studies indicate that the dominant lower-mantle phase, magnesium silicate perovskite (which contains at least half of its iron as Fe 3þ ), undergoes a Fe 3þ high-spin to low-spin transition that has been suggested to cause seismic velocity anomalies and a drop in laboratory-measured electrical conductivity. Here we apply a new synchrotron-based method of Mössbauer spectroscopy and show that Fe 3þ remains in the high-spin state in lower-mantle perovskite at conditions throughout the lower mantle. Electrical conductivity measurements show no conductivity drop in samples with high Fe 3þ , suggesting that the conductivity drop observed previously on samples with high Fe 2þ is due to a transition of Fe 2þ to the intermediate-spin state. Correlation of transport and elastic properties of lower-mantle perovskite with electromagnetic and seismic data may provide a new probe of heterogeneity in the lower mantle.

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Multispace quantum interference in a57Fe synchrotron Mössbauer source

Cited by 26 publications

References 17 publications

MossA: a program for analyzing energy-domain Mössbauer spectra from conventional and synchrotron sources

MossA: a program for analyzing energy-domain Mössbauer spectra from conventional and synchrotron sources

The⁵⁷Fe Synchrotron Mössbauer Source at the ESRF

Effect of iron oxidation state on the electrical conductivity of the Earth’s lower mantle

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Multispace quantum interference in a57Fe synchrotron Mössbauer source

Cited by 26 publications

References 17 publications

MossA: a program for analyzing energy-domain Mössbauer spectra from conventional and synchrotron sources

MossA: a program for analyzing energy-domain Mössbauer spectra from conventional and synchrotron sources

The57Fe Synchrotron Mössbauer Source at the ESRF

Effect of iron oxidation state on the electrical conductivity of the Earth’s lower mantle

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Product

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The⁵⁷Fe Synchrotron Mössbauer Source at the ESRF