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  • 1995-1999  (9)
  • 1970-1974  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Interdiffusion in NiMnSb/V/NiMnSb: X-ray and neutron reflectivity investigation of ion beam sputtered trilayer systems (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5146-5151 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The new trilayer system NiMnSb/V/NiMnSb on MgO(001) was investigated by means of vibrating sample magnetometry (VSM), x-ray, and neutron reflectivity. VSM revealed a coercive field Hc=23 Oe and a hysteresis loop similar to that of an uncoupled ferromagnet. The x-ray and neutron reflectivity data proved that interface roughnesses of 10 Å are present. A detailed analysis yielded significant interdiffusion at the NiMnSb/V interfaces which is one possible explanation for the weak magnetoresistance effect measured in similar NiMnSb-based multilayer systems. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371491
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray characterization of buried allotaxially grown CoSi2 layers in Si(100) (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 5823-5830 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An x-ray study of the interface morphology and lattice parameters of buried expitaxial CoSi2 layers in Si(100) is presented. Specular reflectivity, diffuse and crystal truncation rod scattering, together with grazing incidence diffraction yield detailed information about the interface quality and lattice mismatch. It turns out that the CoSi2 interfaces are considerably smoothened by an annealing step at 1150 °C. Also the in-plane correlation length of the roughness increases yielding laterally smoother interfaces. While the perpendicular lattice parameter is between that of a free relaxed and a pseudomorphic structure and a linear contraction as function of the annealing temperature is obtained, grazing incidence diffraction reveals the opposite effect for the in-plane lattice mismatch. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367439
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gravitational-Wave Astronomy (1972)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 10 (1972), S. 335-374 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.10.090172.002003
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Rotational excitations of a symmetric top in cubic orientational potentials: CH3D matrix-isolated in argon and krypton (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 6880-6890 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements with inelastic neutron scattering of the rotational spectra of the symmetric top molecule CH3D as substitutional impurities in crystalline argon and krypton are presented. The energy of the J=1 doublet is shifted by 33% and 27% respectively, compared to the completely free rotor. Spin-rotational wave functions for the free CH3D rotor are constructed and used for the calculation of the dependence of the scattered intensities on momentum transfer. In contrast to the CH4 molecule, the center of mass does not coincide with the position of the carbon atom in the case of the CH3D molecule. However, energies and intensities can only be explained if this fact is disregarded. The spin conversion behavior has been studied on a CH3D/argon sample within the temperature range 1.5 K≤T≤5 K. Two different mechanisms for the conversion process (libron-phonon process and Raman process) are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470719
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  • 5
    Electronic Resource
    Electronic Resource
    Ammonia rotations in ytterbiumhexaammine (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 1122-1128 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The results of inelastic neutron scattering experiments on ytterbiumhexaammine are presented. At temperatures below 35 K, the dominant dynamical process is a uniaxial rotation of the ammonia in hindering potentials of about 35 meV. At higher temperatures, another type of ammonia motion is observed, which is described as reorientations of entire Yb(NH3)x complexes (x≈6). © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469170
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  • 6
    Electronic Resource
    Electronic Resource
    Rotational excitations of a symmetric top in cubic orientational potentials. II. CHD3 matrix-isolated in argon (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 1764-1769 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Inelastic neutron scattering has been performed on CHD3 molecules matrix isolated in solid argon. Four inelastic lines have been observed within the energy transfer range 0≤(h-dash-bar)ω≤2.5 meV. The corresponding energy level scheme and the line intensities are explained in terms of a model based on a completely free rotation of the CHD3 molecule. An expression for the double differential neutron scattering cross section of the free CHD3 rotor is derived. In spite of a line shift of 44% with respect to the free rotor, no crystal field splitting was observed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472051
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  • 7
    Electronic Resource
    Electronic Resource
    Orientational order and rotational dynamics of the amide ions in potassium amide. II. Quasielastic neutron scattering (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 3559-3567 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ionic molecular crystal potassium amide (KNH2) was investigated by means of quasielastic incoherent neutron scattering (QNS). In the orientationally disordered cubic and tetragonal high–temperature phases as well as in the ordered monoclinic phase reorientational motions of the amide ions (NH2−) are resolved in a frequency range of three orders of magnitude. The QNS spectra are well explained by reorientational models for each phase. Furthermore, the results are compared to structural data and findings of other spectroscopic methods. Finally, a consistent picture of structure and dynamics of all three phases of potassium amide is obtained. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476951
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of orientationally disordered structures. I. Method (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 252-256 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A new method of analyzing the orientational structure of molecular solids is proposed. It is based on an expansion of the coherent scattering-length density of a molecule into a complete set of orthonormal functions. Explicit expressions for the structure factor are given in the three-dimensional case with use of symmetry-adapted cubic harmonics and for planar molecules with use of trigonometric functions. The method is especially well suited for analysis of plastic crystalline phases, orientationally disordered phases and ordered phases with molecules performing large librational motions. The treatment reveals a close analogy between orientationally ordered or disordered systems and magnetic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000653
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of orientationally disordered structures. II. Examples: solid CD4, p-D2 and MD4Br (1973)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 257-263 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In a number of examples a new method of analysing orientational structures of molecular crystals is illustrated. An application to solid heavy methane demonstrates a close analogy to magnetic structures. In the case of solid p-D2, structure factors are calculated on the basis of the rotational wave functions of the individual molecules and a comparison with neutron diffraction data is performed. Finally several solid phases of ND4Br, representative of the ammonium halides, are investigated and a better understanding of the orientational order in the NaCl-type phase is achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739473000665
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  • 10
    Electronic Resource
    Electronic Resource
    High-Order Supersatellite Reflections in Labradorite. A SynchrotronX-ray Diffraction Study (1997)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 632-642 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The supersatellite reflections in the feldspar mineral labradorite are related to the Bøggild intergrowth, a lamellar structure with a periodicity of about 1500 Å. With high-resolution X-ray diffraction using synchrotron radiation, supersatellites up to fourth order are observed. The system is an example for a natural superstructure with high-order diffraction harmonics. The satellite intensities reflect a transverse displacement modulation with a large amplitude. The complete unit cell of labradorite is affected by the displacement. In this context, various possible displacement functions are discussed. A Fourier expansion of the displacement function that yields the best agreement between measurement and theory has nearly triangular shape. The line width of the satellites characterizes imperfections of the lamellar superstructure: It increases linearly with satellite order, which is ascribed to uncorrelated variations (FWHM = 480 Å) of the lamellar thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876739700500X
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