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1982[X]
81Author    Hans Bradaczek, Bernd Leps, Wilhelm UebachRequires cookie*
 Title    A Geometrical Correction for Precise Lattice Constant Determination  
 Abstract    A correction term for high precision lattice constant investigations has been derived, which is caused by geometrical and absorption effects. Surprisingly there is no dependence on absorption and extinction in the case of high absorption and/or "infinite" crystal thickness. Only the half width of the rocking curve has to be considered. In the case of low absorption and/or thin crystal, there are terms of higher order which still depend on p.t but can be neglected compared to the main effect. The main reason for the correction is that the observed rocking curve is the result of a "true" rocking curve multiplied by a geometrical function which is not symmetrical with respect to the rocking angle. For high precision measurements (<10 -5) the application of the correction term is recommended. 
  Reference    Z. Naturforsch. 37a, 448 (1982); received February 3 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0448.pdf 
 Identifier    ZNA-1982-37a-0448 
 Volume    37 
82Author    L. GerwardRequires cookie*
 Title    X-Ray Attenuation Coefficients for Copper in the Energy Range 5 to 50keV  
 Abstract    Dedicated to Professor Dr. G. Hildebrandt on the occasion of his 60th birthday X-ray mass attenuation coefficients for polycrystalline samples of copper have been measured with a high-precision energy-dispersive method. Estimates of the scattering contributions to the attenuation coefficients are made. The photoelectric coefficients deduced from the experimental results are compared with theoretical calculations using screened hydrogen-like eigenfunctions as well as more rigorous relativistic wavefunctions. 
  Reference    Z. Naturforsch. 37a, 451—459 (1982); received February 8 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0451.pdf 
 Identifier    ZNA-1982-37a-0451 
 Volume    37 
83Author    S. TakagiRequires cookie*
 Title    X-Ray Dynamical Diffraction Process Inside a Distorted Crystal  
 Abstract    It is shown that the dynamical diffraction process inside a distorted crystal consists of ordinary dynamical progression inside perfect portions of the crystal and scattering at distortions. The scattered waves proceed as in the perfect crystal and can be multiply scattered. The sum of the primary wave induced at the entrance surface and the waves scattered at distorted parts inside the "inverted Borrmann triangle" gives the resultant wave field at the exit surface. 
  Reference    Z. Naturforsch. 37a, 460—464 (1982); received February 9 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0460.pdf 
 Identifier    ZNA-1982-37a-0460 
 Volume    37 
84Author    M. Kuriyama, G. G. CohenRequires cookie*
 Title    X-Ray Extinction Theory in the Bragg Geometry  
 Abstract    In view of the renewed interest in surface reflection x-ray topography, a unified theory for the Bragg geometry has been laid out to explain the different types of image formation from the scattering point of view. The means by which the photons "infiltrate" a real crystal have been studied. The theory suggests, for example, a mechanism for image contrast inversion in the Bragg geometry, and will also be found to be important in other topics of high current interest, such as x-ray standing wave surface analysis and x-ray inelastic scattering at the Bragg angle. 
  Reference    Z. Naturforsch. 37a, 465—473 (1982); received February 9 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0465.pdf 
 Identifier    ZNA-1982-37a-0465 
 Volume    37 
85Author    D. Lambert, C. MalgrangeRequires cookie*
 Title      
 Abstract    The integrated reflection power for perfect crystals has been measured with neutrons and X-Rays for different crystals in a wide range of absorption coefficients and values of | /ihlfio \ where fjLh is the h Fourier term of the absorption coefficient. The influence of Compton effect and tem-perature factor is discussed. The results are compared to Kato's theoretical values. 
  Reference    Z. Naturforsch. 37a, 474—484 (1982); received February 16 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0474.pdf 
 Identifier    ZNA-1982-37a-0474 
 Volume    37 
86Author    N. KatoRequires cookie*
 Title    On Secondary Extinction  
 Abstract    For the purpose of extinction correction in crystal analysis, the secondary extinction factor y is discussed in the light of the new approach developed by the present author. The mosaic crystal model is adopted. A comparison is made between the present theory and the conventional theory (CT) through functional analysis of y in general cases and numerical analysis in the special case of parallel slab crystals. The y values of CT are underestimated by about 4% and 30% at y = 0.5 and 0.15, respectively. For y> 0.7, CT is practically correct. 
  Reference    Z. Naturforsch. 37a, 485—489 (1982); received February 17 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0485.pdf 
 Identifier    ZNA-1982-37a-0485 
 Volume    37 
87Author    W. TreimerRequires cookie*
 Title    A Calculation of the Neutron (111,111/220) Three Beam Case  
 Abstract    After the development of a very common formalism for neutron three beam cases, a detailed investigation is given for the case (111, 111/220) and a comparisation with the (different) case (111, 111/200) is presented. It is shown that the former case behaves different by concerning dispersion branches and reflection curves; both are asymmetric in respect to a wave incident in the exact Bragg direction and react more sensitive by upon small deviations of the incident wave from this direction. Simple formulae were found for the reflection curves of the intensities for all three beams behind a perfect crystal slab and the Pendellösung period. 
  Reference    Z. Naturforsch. 37a, 490—500 (1982); received February 23 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0490.pdf 
 Identifier    ZNA-1982-37a-0490 
 Volume    37 
88Author    Shih-Lin ChangRequires cookie*
 Title    Coherent Interaction of Multiple Diffracted X-Rays in Crystals  
 Abstract    Coherent dynamical interaction in a 6-beam Borrmann diffraction experiment leading to an unusual intensity enhancement of X-ray transmission in crystals is investigated by using a synchrotron radiation source. A sharp enhanced intensity spot of two seconds of arc beam-divergence is observe 1 on the direct beam at the exact 6-beam diffraction position. The plane-wave dynamical theory is employed to account for the experimental results. The polarization dependence of the crystal excitation by the incident beam is discussed. 
  Reference    Z. Naturforsch. 37a, 501—504 (1982); received March 3 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0501.pdf 
 Identifier    ZNA-1982-37a-0501 
 Volume    37 
89Author    J. D. StephensonRequires cookie*
 Title    White Synchrotron Radiation Topography of (llO) Nickel Single Crystal The influence of a [lTO] Magnetic Field  
 Abstract    Changes in 70.53° magnetic domain structure on the surface of a perfect (llO) nickel crystal have been observed using white synchrotron X-radiation topography. The crystal was influenced by a variable [110] magnetic field. At field strengths > 100 A/m [lll]-spike domains, thought to be traces of [011], 70.53° (oblique) magnetic domain walls, appeared within [lll]-bands (0.4 mm wide) in the topographs. Reversal of the field produced similar spikes at equivalent field values but in different regions of the crystal. 
  Reference    Z. Naturforsch. 37a, 505—511 (1982); received March 8 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0505.pdf 
 Identifier    ZNA-1982-37a-0505 
 Volume    37 
90Author    D. Bader, H. Rauch, A. ZeilingerRequires cookie*
 Title    An Ultra Small Angle Scattering Study of Hydrogen in Metals  
 Abstract    A diffractometer using perfect crystals in symmetric Bragg arrangement, hence being useful for both neutron and X-ray radiation, has been built. The angular resolution of that instrument is better than 1 microradian, which corresponds to a scattering vector resolut ion of about 10~ 6 A _1 . This spectrometer was equipped with a laser light adjustment system which is sensitive to the relative angular position of the two perfect crystals. The spectrometer was used for the mea-surement of neutron scattering at very low angles of hydrated niobium and vanadium samples. The experimental results show an anomalously low attenuation of the neutrons when the metal-H sample is within the solubility a region. This property is explained by a lattice gas model of atomic H in the a-phase of the system. In the two phase region (a — ß) a stronger attenuation of the neutron beam occurs due to the sample now being in an ordered interstitial solution phase. 
  Reference    Z. Naturforsch. 37a, 512—516 (1982); received March 29 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0512.pdf 
 Identifier    ZNA-1982-37a-0512 
 Volume    37 
91Author    Roman Sexl, Helmuth UrbantkeRequires cookie*
 Title      
 Abstract    The transformation properties of the Dirac-equation deriv-ed by Sallhofer from electromagnetic principles are investi-gated. 
  Reference    Z. Naturforsch. 37a, 517 (1982); received February 21 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0517_n.pdf 
 Identifier    ZNA-1982-37a-0517_n 
 Volume    37 
92Author    0. Brümmer, H. R. Höche, J. NieberRequires cookie*
 Title    Limits of the X-Ray Collimation by One Asymmetrical Bragg Reflection-Wittenberg (DDR)  
 Abstract    In connection with the production of highly collimated X-rays the study of extremely asym-metrical Bragg reflections became of interest. In this paper the so-called extended dynamical theory of X-ray diffraction will be tested experimentally. As a result of this investigations the optimum conditions for X-ray collimation by means of one asymmetrical Bragg reflection are being discussed. 
  Reference    Z. Naturforsch. 37a, 519 (1982); received January 15 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0519.pdf 
 Identifier    ZNA-1982-37a-0519 
 Volume    37 
93Author    0. Brümmer, Ch Eisenschmidt, H. R. HöcheRequires cookie*
 Title    Generation and Proof of Elliptically Polarized X-Rays  
 Abstract    Using an arrangement being analogous to optics of visible light the phase relation of the mutu-ally perpendicularly polarized wave fields are examined in the Laue case of X-ray diffraction. Bragg reflections at an angle of reflection of about 45° are used as polarizer and analyzer. The dif-ferent phase relations result from different thicknesses of a wedge-shaped silicon crystal, which is placed between the polarizer and the analyzer and adjusted for the symmetric 220-CiiKai-Laue case. The determined polarization states produced by coherent excitation of both cr-polarized and rr-polarized waves in the silicon crystal coincide very well with calculations of the dynamical theory of X-ray diffraction. 
  Reference    Z. Naturforsch. 37a, 524—527 (1982); received January 15 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0524.pdf 
 Identifier    ZNA-1982-37a-0524 
 Volume    37 
94Author    Ben Post, Po Wen, Wang, Tommy HornRequires cookie*
 Title    Intensity Attenuation and Enhancement in 3-beam Diffraction  
 Abstract    A simplified version of the x-ray dispersion surface is described for use in the interpretation of simultaneous 3-beam Borrmann diffraction photographs. Examples of such photographs are discussed and analyzed in terms of the simplified dispersion surfaces. 
  Reference    Z. Naturforsch. 37a, 528—535 (1982); received March 22 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0528.pdf 
 Identifier    ZNA-1982-37a-0528 
 Volume    37 
95Author    G. Amoretti, C. Fava, V. VaraccaRequires cookie*
 Title    Superposition Model Analysis of the Spin Hamiltonian Parameters of Two Gd 3+ Doped Thorium Dichalcogenides  
 Abstract    The spin Hamiltonian parameters of Gd 3+ in a single crystal of Thorium disulfide (TI1S2) are analysed by means of the superposition model, in its most general form of a two exponents power law. In fact, the approximated one exponent power law is not suitable for this compound, where the ion-ligand distances show a quite large spread. The results of the analysis are then applied to the case of Gd 3+ doped Thorium oxysulfide (ThOS), where the fitting of the experimental data is possible only assuming some distortion of the ligand cage. 
  Reference    Z. Naturforsch. 37a, 536—545 (1982); received January 8 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0536.pdf 
 Identifier    ZNA-1982-37a-0536 
 Volume    37 
96Author    E.J S LageRequires cookie*
 Title    On the Theory of the Magnetic Resistivity near a Ferromagnetic Phase Transition  
 Abstract    Perturbation theory is applied to the evaluation of the magnetic resistivity of a magnetic metal near a ferromagnetic phase transition. The method starts from first principles and uses diagram-matic expansions together with the theory of spin cumulant averages. Emphasis is put on some critical hypothesis regarding the behaviour of the coupled electron-spin system. A generalization of the de-Gennes-Friedel expressions for the static conductivity is derived and arguments are advanced regarding its energy like critical behaviour. A short discussion is also given for the frequency dependent conductivity and it is shown that it deviates from Drude's law. 
  Reference    Z. Naturforsch. 37a, 546 (1982); received December 22 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0546.pdf 
 Identifier    ZNA-1982-37a-0546 
 Volume    37 
97Author    Dipak Ghosh, Jaya Roy, Kaushik Sengupta, Sadhan Naha, Madhumita Basu, Tarit Guhathakurta, Anuradha BhattacharjeeRequires cookie*
 Title    Cumulative Rapidity Gap-distribution and Cluster Characteristics in Proton-emulsion Interaction at 300 GeV/c  
 Abstract    Multiparticle rapidity clustering in proton-emulsion interactions at 300 GeV/c is studied using cumulative rapidity-gap distributions. Both 2-particle and 3-particle clusters have been observed. 
  Reference    Z. Naturforsch. 37a, 555—558 (1982); received November 19 1981 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0555.pdf 
 Identifier    ZNA-1982-37a-0555 
 Volume    37 
98Author    K.-H Gericke, F. J. ComesRequires cookie*
 Title    Influence of Rotational Relaxation on Tropospheric OH Laser Induced Fluorescence Measurements  
 Abstract    Rotational relaxation of OH molecules in the -II electronic ground state has been observed to occur in collisions with water molecules with gas kinetic probability. It causes an additional contribution to the already well known sources of interference when LIF is used to monitor tropospheric OH. As the laser generated OH is originally produced mostly in high rotational states, the fast relaxation phenomenon leads to a further population of OH in low rotational states. These states are used to monitor tropospheric OH by spectroscopic methods. The observed effect therefore increases the interference. A mathematical analysis is presented, revealing the effect of all relevant parameters. 
  Reference    Z. Naturforsch. 37a, 559—563 (1982); received March 17 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0559.pdf 
 Identifier    ZNA-1982-37a-0559 
 Volume    37 
99Author    G. Ebbinghaus, A. Simon, A. GriffithRequires cookie*
 Title    Photoemission von Gd, Tb und den metallreichen Chloriden Gd2Cl3 und Tb2Cl3  
 Abstract    Photoemission of Gd, Tb and, the metal-rich chlorides Gd%Clz and Tb^Chz The photoelectron spectra (AlKa, Hell, Hei) of Gd, Tb, Gd2Cl3 and Tb2Cl3 are measured and discussed. They clearly indicate 4f 7 -and 4f 8 -configuration for the sesquihalides of Gd and Tb, respectively. In the case of Gd2Cl3 a band gap of approximately 1 eV is estimated. 
  Reference    Z. Naturforsch. 37a, 564—567 (1982); received March 26 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0564.pdf 
 Identifier    ZNA-1982-37a-0564 
 Volume    37 
100Author    Wolfgang Bauhofer, Arndt SimonRequires cookie*
 Title    Elektrische und optische Eigenschaften von Gd2Cl3 und Tb2Cl3  
 Abstract    Electrical and optical properties of GdzCl^ and Tb^Cl^ The electrical resistivity of Gd2Cl3 and Tb2Cl3 has been investigated as a function of temper-ature. Conventional measurements on powder pellets as well as contactless microwave measure-ments on small single crystals yield a semiconducting behaviour for both componds with energy gaps of about 0.85 eV for Gd2Cl3 and 1.1 eV for T62CI3. The measurements indicate a strong anisotropy of the resistivity. The reflectivity of Tb2Cl3 has been studied in the energy range from 1.1 to 4 eV. 
  Reference    Z. Naturforsch. 37a, 568—571 (1982); received March 26 1982 
  Published    1982 
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 TEI-XML for    default:Reihe_A/37/ZNA-1982-37a-0568.pdf 
 Identifier    ZNA-1982-37a-0568 
 Volume    37 
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