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  • 1
    Electronic Resource
    Electronic Resource
    Mössbauer spectroscopy of minerals (1994)
    Springer
    Physics and chemistry of minerals 21 (1994), S. 258-267 
    Details
    ISSN: 1432-2021
    Keywords: Quadrupole splitting distribution ; Mössbauer ; phlogopite ; biotite ; annite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract We develop the methodology of quadrupole splitting distribution (QSD) analysis by evaluating the influences of absorber thickness, absorber texture, and the asumed Lorentzian width on the extracted QSD. We then present the first study to describe the Mössbauer spectra of members of a mineral family in terms of QSDs. The Fe2+ QSD and its characteristics (average QS, peak QS, skewness, and standard deviation) show gradual trends with changing Fe/(Fe+Mg) in a synthetic Al-deficient phlogopite-annite series. Al-deficient natural samples of phlogopite and annite show similar behaviour. The Fe2+ QSDs can be interpreted as population distributions of local distortion environments (LDEs) and, as such, contain much information that will become more accessible as theoretical calculations linking particular LDEs to corresponding QS values are developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202140
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  • 2
    Electronic Resource
    Electronic Resource
    Octahedral-site Fe2+ quadrupole splitting distributions from Mössbauer spectroscopy along the (OH, F)-annite join (1996)
    Springer
    Physics and chemistry of minerals 23 (1996), S. 63-71 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract We have performed a detailed Mössbauer study of synthetic annites on the (OH, F)-join. Recently developed data treatment and spectral analysis methods were used to extract true intrinsic Fe2+ quadrupole splitting distributions (QSDs) that represent the most information that can be resolved from the spectra. The overall room temperature (RT) QSDs can be consistently interpreted in terms of four QSD contributions (or populations) centered at: QSHH∼2.55 mm/s for Fe2+O4(OH)2 octahedra (cis and trans not resolved), QSHF ∼ 2.35 mm/s for Fe2+O4(OH)F octahedra (cis and trans not resolved), QScFF∼2.15 mm/s for cis-Fe2+O4F2 octahedra, and QStFF∼ 1.5 mm/s for trans-Fe2+O4F2 octahedra. Each such contribution has a width (σΔ ∼ 0.2 mm/s) caused by distortions of the octahedra. Minor contributions due to Fe2+O5(OH) and Fe2+O5F octahedra probably also contribute to the overall Fe2+ QSDs. The ferric iron spectral components were also characterized. Here, two distinct types of octahedral Fe3+ contributions are seen and interpreted as being due mainly to Fe3+O5OH and Fe3+O5F octahedra, respectively. Tetrahedral Fe3+ is seen only in the OH-annite end-member and the total Fe3+ content drops significantly on addition of F.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202995
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  • 3
    Electronic Resource
    Electronic Resource
    Absolute quantitative analysis by Mössbauer spectroscopy (1992)
    Springer
    Hyperfine interactions 71 (1992), S. 1437-1440 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We develop a method for measuring the Fe-57 Mössbauer absorber thickness parameter ta ≡ nafaσo for the case of Zeeman split hyperfine patterns with well-separated lines. The method is independent of experimental conditions such as: counting efficiency, electronic window settings, absorber thickness, temperature, source lineshape, background level, velocity calibration, absorber orientational texture, source strength, ordinary mass absorption, etc. Only the raw spectral data are needed. We have tested the method in detail with metallic foils having various thicknesses between ta=2 and 35. It works well and can be generalized to other types of spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397353
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  • 4
    Electronic Resource
    Electronic Resource
    An effective method of direct QSD extraction using combined partial deconvolution (1994)
    Springer
    Hyperfine interactions 92 (1994), S. 1203-1207 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We demonstrate the use and robustness of a new quadrupole splitting distribution extraction method that gives unique arbitrary shapeP(tΔ) curves and is not sensitive to the elemental doublet parameters or to practical details such as chosen velocity and splitting ranges. It is applied to the real57Fe Mössbauer spectrum of an Fe3+-chlorite produced by oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065756
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  • 5
    Electronic Resource
    Electronic Resource
    Measured and predicted hyperfine field distributions (HFD's) in fcc Fe−Ni collinear ferromagnets (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 497-500 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At compositions C〈45 at. %Fe, Fe−Ni has a well-known collinear ferromagnetic ground state with no deviation from the Slater-Pauling curve and saturation moments on Fe and Ni of 2.8 and 0.6 μβ′, respectively. At these compositions and at all temperatures T〈295 K, the HFD's extracted from the Fe-57 Mossbauer spectra by a new method are shown to be in excellent agreement with predicted HFD's calculated with no free parameters. The calculation assumes that the transferred hyperfine fields are from near neighbours only and uses parameters that are uniquely determined by the behaviour of the average hyperfine field versus composition. This proves the validity of the underlying physics in both the extraction procedure and the calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401873
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  • 6
    Electronic Resource
    Electronic Resource
    Thickness effects with intrinsically broad absorption lines (1992)
    Springer
    Hyperfine interactions 71 (1992), S. 1433-1436 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thickness effects have been studied extensively, both numerically and analytically, only for the case where the intrinsic absorber cross-section, σa, is an elemental Lorentzian line having the natural Heisenberg width. Thickness effects with σa's corresponding to intrinsically (homogeneously or inhomogeneously) broadened lines have hardly not been studied. We report a numerical study of the latter case in which the σa's are taken to be single Voigt lines of various Gaussian-width to Heisenberg-width ratios (O ≤ σ/Гo ≤ 10). We obtain “phase diagrams” showing effectively thin-absorber regions in the plane of intrinsic broadening (σ/Гo or FWHM of σa) versus total absorber thickness (O ≤ ta ≡ fanaσo ≤ 10). These diagrams are useful in evaluating when and to what extent spectral distortions from thickness effects need to be taken into account in real situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397352
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  • 7
    Electronic Resource
    Electronic Resource
    Failure of the direct HFD extraction method (1994)
    Springer
    Hyperfine interactions 92 (1994), S. 1209-1212 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is well known that, in principle, hyperfine field distributions can be obtained from Mössbauer spectra by direct extraction using simple matrix inversion. We explore the limits of this method in terms of the spectral signal/noise ratio, elemental sextet parameter uncertainties and matrix dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065757
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  • 8
    Electronic Resource
    Electronic Resource
    Voigt-based methods for arbitrary shape quadrupole splitting distributions (QSD's) applied to quasi-crystals (1992)
    Springer
    Hyperfine interactions 69 (1992), S. 493-496 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is now well established that, as with amorphous alloys, the Mössbauer spectra of icosahedral alloys exhibit QSD's. This is evidence for intrinsic local disorder present in icosahedral structures. The shapes of the QSD's have not been unambiguously established and, as a result, it has been difficult to link these shapes with other physical properties of these novel and complex alloys. We apply a recently developed arbitrary shape static hyperfine parameter distribution method to the case of a new icosahedral alloy series: Al65Cu20Cr15-xFex. The method proves to be a powerful and useful tool in this application. It enables us to evaluate several robust features and to identify other features that are subject to large uncertainties due to extreme sensitivity to details.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401872
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  • 9
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    Three-dimensional fast magnetic reconnection driven by relativistic ultraintense femtosecond lasers (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-03-08
    Description: Author(s): Y. L. Ping, J. Y. Zhong, Z. M. Sheng, X. G. Wang, B. Liu, Y. T. Li, X. Q. Yan, X. T. He, J. Zhang, and G. Zhao Three-dimensional fast magnetic reconnection driven by two ultraintense femtosecond laser pulses is investigated by relativistic particle-in-cell simulation, where the two paralleled incident laser beams are shot into a near-critical plasma layer to form a magnetic reconnection configuration in self... [Phys. Rev. E 89, 031101] Published Fri Mar 07, 2014
    Keywords: Plasma Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Mössbauer spectroscopy of minerals (1994)
    Springer
    Details
    Publication Date: 1994-08-01
    Print ISSN: 0342-1791
    Electronic ISSN: 1432-2021
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Springer
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