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  • 1
    Electronic Resource
    Electronic Resource
    Über einige Probleme bei instabilen quantenmechanischen Systemen (1965)
    Springer
    The European physical journal 186 (1965), S. 168-189 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract If an exponential decay law is measured (which clearly need not be found in every case) it cannot be concluded that the line shape must be lorentzian. To show that the possible energy spectra may differ from a Lorentz shape by a well measurable amount an example of such a spectrum is constructed, leading to an exponential decay law in an even better approximation than a lorentzian spectrum. Hereafter various facts about decaying systems are discussed in connection with scattering theory. Finally it is shown that ordinary Mößbauer experiments are not suited for line shape measurements and modified experiments are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380733
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchung des Zerfalls $$Bi^{212} (ThC)\xrightarrow{\beta }Po^{212} (ThC')\xrightarrow{\alpha }Pb^{208} (ThD)$$ durch (γ, α)-Koinzidenzen (1960)
    Springer
    The European physical journal 158 (1960), S. 405-416 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theγ-spektrum of Po212 (ThC′) has been measured by (γ, α)-coincidences with a fast-slow coincidence apparatus. The results are in excellent agreement with the conversion lines found by theLatyshev group. The absoluteγ-intensities have also been determined in order to get spins and parities of the levels by calculating the absolute conversion coefficients. Theβ-intensity leading to the exited states of Po212(ThC′) is estimated to be about one third of that measured byBurde andRozner by (β, α)-coincidences. Threeγ-lines measured byChinaglia andDemichelis by (γ, α)-coincidences do not agree with our results. The 2+ assignment of the first exited state is now well established, but for the other levels in the decay scheme there is still some uncertainty concerning spin and level assignment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327018
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  • 3
    Electronic Resource
    Electronic Resource
    Isomerieverschiebung und Quadrupolaufspaltung beim Mößbauer-Effekt von Fe57 in Eisenverbindungen (1963)
    Springer
    The European physical journal 175 (1963), S. 200-220 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Data from previous measurements are discussed from the point of view of isomeric shift and quadrupole splitting. For a comparison of isomeric shifts the magnitude of temperature shifts have to be regarded. Information about electric field gradients arises from the magnitude and the temperature dependence of quadrupole splittings. After putting the data into a suitable form, characteristic regions of the value of line shift, quadrupole splitting and temperature dependence of the splitting for different bond types are obtained. Besides this, influences of the crystal field are to be considered. Different types of contributions to the electric field gradient are discussed. The main features of field gradients in iron ions and molecules with and without closed electron shells are derived and compared with the experimental results. The result that the isomeric shifts for covalent bond iron in the oxydation states 0, +2, +3 and metallic bond iron are distributed over the same region whilst the ions Fe2+, Fe3+ and [FeVIO4]2− each have characteristic values is discussed.π-bonds in addition to σ-bonds and partially ionic bonds have to be considered. Based on the foregoing discussion the connection between the strength ofπ-bonds and the value of isomeric shifts and quadrupole-splittings and the sign of field gradients is regarded for iron ions and molecules, where ligands have been exchanged. Finally examples for the interdependence of the structure of multicenter-molecules and -ions and the data are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01375201
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchung von Kristalleigenschaften mit Hilfe des Mößbauer-Effekts von Fe57 (1962)
    Springer
    The European physical journal 167 (1962), S. 194-204 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A further evaluation and discussion of data obtained in a previous investigation on Mößbauer effect in iron compounds has been carried out. In addition to the confirmation of the grouping of line shifts for trivalent and for divalent iron compounds, suggestions for an explanation of the behaviour of complex salts are made. The temperature dependence of the shift, which had been known only for Fe-metal, is shown to be linear in the range of measurement for all substances, which have been investigated, having an astonishing small slope for the complex salts. The quadrupole splitting and its temperature dependence is discussed for the different types of chemical bonds involved. After elimination of the dependences on absorber thickness and temperature from the measured linewidths, it was shown that the source of Co57 in Pt has about the natural linewidth and that there is a line broadening in most absorbers increasing with chemical instability. Using the temperature dependence an accurate determination of Debye-Waller factors is possible. These factors show a grouping for salts and for metals respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378832
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchung komplexer und kovalenter Eisenverbindungen mit Hilfe des Mößbauer-Effekts von Fe57 (1963)
    Springer
    The European physical journal 173 (1963), S. 321-346 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A number of complex and covalent iron compounds in the oxydation states 0, +2, +3, +6 and with coordination numbers 4, 5, 6 has been investigated at different temperatures. A source of Co57 in Pd has been made, which was shown to be well suited for such measurements. The influence of the cristalline environment has been studied by putting iron complexes in different lattices. Ligands of iron complexes have been exchanged to look for influences of different bonds. It has been shown that measurements are also possible in frozen solutions and applications of this method are discussed. It has been found that in Prussian blue and Turnbulls blue there is no socalled electron exchange between the different Fe. The Curie point of KFeS2 has been determined to be −28° C and it was possible to study the fields and lineshifts in its neighbourhood. For some compounds indications for their structure and the sign of the electric field gradient could be derived from the data. The data are compiled in tables to allow further discussions from different points of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01377831
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  • 6
    Electronic Resource
    Electronic Resource
    Messungen des Mößbauer-Effekts von Fe57 in zahlreichen Eisenverbindungen bei verschiedenen Temperaturen (1962)
    Springer
    The European physical journal 167 (1962), S. 176-193 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A systematic investigation of iron compounds has been performed using the Mößbauer effect. The velocity recording system was similar to that used by Sunyar, containing, however, a different type of velocity-to-pulse-height converter, an 800 ohm loudspeaker, a highly-stabilized wideband-dc amplifier, and only oneγ-ray detector. A source of Co57, diffused in Pt, with about the natural linewidth and low background was used. Precise data of shifts, splittings, widths, and intensities of the absorption lines are given for various compounds at different temperatures. The shift of the lines has been detected for small temperature differences. A small quadrupole splitting has been measured for some trivalent iron salts. Our data confirm the grouping of the shifts of trivalent and divalent iron compounds and allow the possibility of further discussions of line shifts, quadrupole splittings, Debye-Waller-factors, and the temperature dependence of these quantities. In addition, a comparison between scattering experiments and transmission experiments has been made, and resonance has been found also with sources of Co-salts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378831
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  • 7
    Electronic Resource
    Electronic Resource
    On the handling of fermion integrations in lattice gauge theory (1984)
    Springer
    The European physical journal 22 (1984), S. 185-188 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Instead of the usual evaluation in terms of products of propagators and determinant the direct representation by minors of the respective orders is considered. After introducing generalized determinants and minors recursion relations are proved. These relations in turn are used to derive sum representations which express the quantities of interest explicitly by loop and string terms. Then relations for the decomposition of matrices are given which provide a basis for approximation methods. The finite sums, which solely occur for a finite lattice, can be arranged to become series representations in the infinite-volume limit. A procedure to optimize the convergence of these series is proposed. Finally the specific fermion-matrix form is discussed in the light of these developments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01572170
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  • 8
    Electronic Resource
    Electronic Resource
    Eine Integralgleichungsmethode zur Behandlung der Streuung an gebundenen Teilchen (1967)
    Springer
    The European physical journal 200 (1967), S. 36-56 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract First it is pointed out that various methods known for the treatment of multi-particle scattering problems such as the methods ofLax, Watson, andFaddeev are based on the same type ofT-operator equations with eliminated interactions. They only differ by the identification of the interactions. — Then an integral equation treatment for the scattering of a particle by a system ofn bound particles is developed. If the scattering occurs via local two-body forces, the interaction matrix element splits into that of the two-particle case and a momentum-dependent factor. This fact is used to simplify the scattering equations which then get a mathematical structure similar to that of theT-operator equations discussed at the beginning (however, involving sums of bound states rather than sums of interactions) and which, therefore, can be handled in a similar way. When the interactions are eliminated by means of the two-particle scattering amplitudes, the off-shell energy parameter of these amplitudes may be chosen to be dependent on quantum numbers of the bound system. Such a choice shows indeed to be favorable if one likes to keep only the lowest order approximation of the integral equations. The resulting approximate formula leads, after some further approximations, for resonant scattering to a formula ofLamb, and for weakly energy-dependent amplitudes to a formula ofFermi (being related to the impulse approximation). — The resonant scattering formula is applied to a quantum-mechanical derivation of a method for the determination of nuclear lifetimes which had been proposed on semiclassical arguments byCiocchetti et al. — Finally the method developed for the scattering of a particle by a system of bound particles is extended to collisions between composite particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326081
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Struktur komplexer EisenverbindungenProfessor Robert Juza zum 60. Geburtstage gewidmet (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 333 (1964), S. 235-247 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The isomeric shift and quadrupole splitting data of the MÖSSBAUER spectra of iron coordination compounds are recorded. Prussian blue and TURNBULLs blue are true iron(III) hexacyanoferrates(II) there is no evidence for a “valency exchange” between iron(II) and iron(III). For Fe3(CO)12 a linear arrangement of the iron atoms is proven. The outer iron atoms are coordinated by six, the inner atom by four CO groups. In Fe2(CO)9 each iron atom has the coordination number 6. An Fe—Fe bond does not exist. The isomeric shifts of iron coordination compounds prove the validity of PAULINGs electroneutrality principle. The CURIE point of KFeS2 has been determined to be -28 ± 2°C. The π-bond strengths of the single ligands in prussiates decrease in the series NO+ 〈 SO3-- 〈 NO2- = NH3.
    Notes: Es werden die Daten der MÖSSBAUER-Spektren komplexer Eisenverbindungen berichtet. Berlinerblau und TURNBULLs Blau sind Eisen(III)-hexacyanoferrate(II) ein Wertigkeitsausgleich zwischen Eisen(III) existiert nicht. Für Fe3(CO)12 wurde eine lineare Anordnung der Eisenatome bewiesen, bei der die beiden äußeren Eisenatome von je sechs, das mittlere Eisenatom von vier CO-Gruppen umgeben ist. In Fe2(CO)9 hat jedes Eisenatom die Koordinationszahl 6. Eine Eisen - Eisen-Bindung liegt nicht vor. Die Isomerieverschiebungen komplexer Eisenverbindungen stellen einen experimentellen Beweis für die Gültigkeit des Elektroneutralitätsprinzips von PAULING dar. Der CURIE-Punkt von KFeS2 wurde zu  -  28 ± 2°C bestimmt. Die π-Bindungsstärken der einzelnen Liganden in Prussiationen nehmen in der Reihenfolge NO+ 〈 SO3-- 〈 NO2- = NH3 ab.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643330410
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  • 10
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    Decorrelation of the topological charge in tempered Hybrid Monte Carlo simulations of QCD (1999)
    Details
    Publication Date: 2014-02-26
    Description: We study the improvement of simulations of QCD with dynamical Wilson fermions by combining the Hybrid Monte Carlo algorithm with parallel tempering. As an indicator for decorrelation we use the topological charge.
    Keywords: ddc:000
    Language: English
    Type: reportzib , doc-type:preprint
    Format: application/postscript
    Format: application/pdf
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