Zur Theorie der Feinstruktur in den R�ntgenabsorptionsspektren

Kronig, R. de L.

doi:10.1007/bf01339581

Cited by 285 publications

(27 citation statements)

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“…In his first work he suggested the long range order (LRO) interpretation of XAFS in crystalline materials; i.e. the fine structure in x-ray absorption is determined by the features of the band structure (Kronig, 1931). In his second paper he developed a short range order (SRO) theory for the molecules within a single scattering plane wave approximation (Kronig,1932).…”

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confidence: 99%

Real-space multiple-scattering approach to XANES

1999

J Synchrotron Radiat

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The historical development of ideas in x-ray absorption and multiple scattering theory that lead to real space, multiple scattering (RSMS) calculations of XANES is reviewed. The RSMS method for both XANES and electronic structure calculations has several advantages with respect to other approaches. Recently developed RSMS codes now provide a way to interpret XANES in terms of structural and electronic information. The sensitivity of XANES calcula-tions to muffin-tin potential construction, self-consistency and selfenergy is demonstrated for the Ti K edge of PbTiO 3. Future RSMS electronic structure codes require several improvements, such as non-spherical potentials and inclusion of many body effects in order to achieve more quantitative agreement with experiment.

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confidence: 99%

Real-space multiple-scattering approach to XANES

1999

J Synchrotron Radiat

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“…The fine structure above an absorption edge is known since almost a century. The first observations were made by Fricke [189] and by Hertz [190] and theoretically interpreted by de Kronig [191] involving a long range order theory. It took until the early 1970s of the last century to formulate a correct theory of EXAFS in terms of a short range order [192]: it also established a path for the analysis using the Fourier Transformation (FT) of the χðkÞ function which is defined as χðkÞ ¼ ½μðEÞÀμ 0 ðEÞ=μ 0 ðEÞ, where k represents the wavenumber of the electron at an energy E above E 0 according to the…”

Section: Historical Background and Theorymentioning

confidence: 96%

Effect of mesoscopic misfit on growth, morphology, electronic properties and magnetism of nanostructures at metallic surfaces

Brovko

Бажанов

Meyerheim

et al. 2014

Surface Science Reports

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Stress and strain originating from mesoscopic misfit at interfaces can have diverse effects on the properties of surfaces and nanostructures thereon. We review the sources and consequences of mesoscopic misfit at metallic surfaces and elucidate various ways in which it affects growth, morphology, electronic properties and magnetism of thin films in early stages of epitaxy and epitaxial nanostructures.

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“…In this way the EXAFS can be interpreted in terms of the number, nature and distance of the backscattering atoms near to the absorbing (target) atom. The XANES structure was first recognised by Kossel (1920) and the EXAFS by Kronig (1931). Although both phenomena have been known for over sixty years, the earlier developments were slow mainly due to the lack of high quality experimental data for comparison with the different theories based on the concepts of the long-range order and short-range order.…”

Section: (A) (B)mentioning

confidence: 99%

Conducting Polymers and Polymer Electrolytes

Rubinson¹,

Mark²

2002

ACS Symposium Series

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UMI Number: U547216All rights reserved INFORMATION TO ALL U SE R S The quality of this reproduction is d ep endent upon the quality of the copy submitted.In the unlikely event that the author did not sen d a com plete manuscript and there are m issing p a g es, th e se will be noted. Also, if material had to be removed, a note will indicate the deletion. Disscrrlation PublishingUMI CONDUCTING POLYMERS AND POLYMER ELECTROLYTESby Walkiria Santos Schlindwein Abstract Polymers are mostly used as insulator materials. Since the late sixties, two new classes of polymeric materials possessing either ionic or electronic conductivities have been extensively studied. The work carried out in this thesis concerns of the study of polymer electrolytes based on poly (ethylene oxide) (PEO) complexed with divalent salts (ionic conductors) and polypyrroles (PPy) electrochem icdly and chemically prepared (electronic conductors). DiÉerent techniques were used to study their properties including Differential Scanning Calorimetry 03SC), Variable Temperature Polarising M icroscopy (VTPM), Extended X-ray Absorption Fine Structure (EXAFS), a.c. Impedance, Cyclic Voltammetry, and Fourier Transform Infra-Red Spectroscopy (FTIR).W ater-cast film s o f P E 0n:Z nX 2 (X = Cl, Br, I) were prepared at a range of stoichiometries. The effects of either residual presence of water or thermal treatment related to the formation of high melting crystalline materials were investigated. The morphology of the zinc halides films differs from similar films cast from acetonitrile/methanol mixtures. The presence of high melting crystalline material in the water cast samples is influenced mostly by the concentration, type of anion and drying procedure applied to the samples. The high melting crystalline materials in the zinc samples are more affected by the drying regime. In some cases, solvent effects can be removed by using a high temperature (e.g. 180°C) drying regime. The presence of water normally depresses the melting temperature of the crystalline structures.Films of PE0 n:CaBr2 and PE0 n:NiBr2 cast from water were also examined. The high melting crystalline materials in the calcium samples are more affected by the presence of water. The nickel samples are highly crystalline and the presence of high melting material does not seem to be influenced by either the presence of solvent or the drying procedure.EXAFS was used as a suitable technique to probe the local structure surrounding the cation. The results of the zinc halide samples gave some indication o f the interionic and polym er-cation interactions. It was demonstrated that the halogen provides the most substantial contribution for the total EXAFS spectrum and the oxygen contribution is much less significant, except in the case of PEOn:ZnCl2 samples. This could be due to the size of the nearest neighbour atoms and/or to the interaction polymer-cation. The presence of neutral "ion pairing" is suggested for the PEOn:ZnBr2 samples. The EXAFS results for the samples containing NiBr2 indicated a stro...

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Zur Theorie der Feinstruktur in den R�ntgenabsorptionsspektren

Cited by 285 publications

References 0 publications

Real-space multiple-scattering approach to XANES

Real-space multiple-scattering approach to XANES

Effect of mesoscopic misfit on growth, morphology, electronic properties and magnetism of nanostructures at metallic surfaces

Conducting Polymers and Polymer Electrolytes

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