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  • 1
    Electronic Resource
    Electronic Resource
    Fine structure in the χ(2) signals of inorganic-organic nanocomposites (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2709-2711 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of organically modified ceramics with nonlinear-optical-active chromophores produced in a sol-gel process exhibit Maker fringe signals which are superimposed by a periodic fine structure. The fine structure is shown to be due to Fabry–Perot resonances of the second-harmonic light which are stronger as compared to the amplitude corresponding to the regular Fresnel surface reflectivity by one to two orders of magnitude. The effect which is also observed on unpoled samples is tentatively ascribed to an accumulation and partial spontaneous orientation of the chromophores at the film surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356201
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  • 2
    Electronic Resource
    Electronic Resource
    Path integral quantization of the dyonium (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 2231-2233 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The dyonium is solved exactly by path integration. The Green's function for the dyonium is separated into the monopole harmonics and the radial path integral, and the radial Green's function is found in closed form. The exact energy spectrum is also obtained. Dirac's charge quantization condition is seen to be essential for performing path integration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526852
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray resonant magnetic scattering from FePd thin films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5469-5471 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Depending on the growth conditions, FePd thin films can display a perpendicular magnetic anisotropy associated with chemical order. In competition with the shape anisotropy, this can lead to striped magnetic domains, with moments perpendicular to the film plane. Under these circumstances, magnetic flux closure should occur. The striped domains were studied with soft x-ray resonant magnetic scattering using circularly polarized light to demonstrate the presence of closure domains. Magnetic depth profiling was performed both at the Fe and Pd L3 edge, by measuring the magnetic diffraction peak intensities versus angle of incidence θ. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373375
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  • 4
    Electronic Resource
    Electronic Resource
    Electron correlation and charge transfer at the Ni/Co interface (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5466-5468 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evolving magnetism and electronic structure at the Ni/Co interface have been studied using x-ray absorption spectroscopy (XAS) and x-ray photoemission spectroscopy (XPS) with circularly polarized x rays. Deposition of ultrathin Ni films on thin films of Co grown on Cu(001) results in an intensity enhancement across the Co L2.3 absorption edge. By comparison, the intensity of the Ni L2.3 edge decreases as a function of Ni film thickness. The relative changes in the Ni and Co XAS intensities are interpreted as an electronic charge transfer from the Co to the Ni. Distinct changes in the Co 2p XAS and XPS line shapes after addition of the Ni overlayer imply a modification of the Co 3d electron correlation due to the charge transfer. The change in the electronic structure is related to the interface magnetism using magnetic circular dichroism sum rule analysis. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373374
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic circular x-ray dichroism in transverse geometry: A new tool to study the magnetocrystalline anisotropy : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5355-5357 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The orbital and spin magnetic moments in 3d transition metals are no longer collinear when the electron spins are forced out of their easy direction by an applied magnetic field. This effect provides a new way to measure the anisotropy of the orbital magnetic moment using magnetic circular x-ray dichroism in a geometry where the photon helicity vector is perpendicular to the magnetization direction. As an experimental corroboration we studied the magnetic anisotropy in the Co orbital moment of a Co/Pt multilayer. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364544
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  • 6
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1977)
    Springer
    Naturwissenschaften 64 (1977), S. 443-444 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00508711
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Wechselwirkung der Elementarteilchen (1973)
    Springer
    Naturwissenschaften 60 (1973), S. 274-280 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624441
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  • 8
    Electronic Resource
    Electronic Resource
    The determination of shadowing critical angles in impact collision ion scattering spectroscopy (1988)
    Springer
    Applied physics 45 (1988), S. 63-67 
    Details
    ISSN: 1432-0630
    Keywords: 79.20.Nc ; 79.20.Rf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Critical angles for shadowing in low-energy ion scattering spectroscopy are calculated in the momentum approximation for the Thomas-Fermi-Molière potential and the Ziegler-Biersack-Littmark potential. In the relevant parameter range the results can be fitted by a formula containing five constants depending on the potential only. For a fixed projectile-target combination at a given energy the distance dependence of the critical angle is described by a simple power law. The comparison of the calculated results with experimental data shows that the inclusion of the effect of thermal vibrations on the critical angles improves the agreement between calculations and experiment significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618764
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  • 9
    Electronic Resource
    Electronic Resource
    Laser photolytic deposition of molybdenum and tungsten thin film microstructures (1990)
    Springer
    Applied physics 50 (1990), S. 233-235 
    Details
    ISSN: 1432-0630
    Keywords: 81.15 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have deposited thin metal films of Mo and W with sub-μm lateral resolution using the photodissociation of the carbonyls by the frequency doubled radiation of an Arion laser at cw and ps-pulse operation, respectively. In both regimes similar curves are obtained for the intensity dependence of the deposition rate. No difference was observed for the lateral resolution using cw or ps-pulse irradiation. Measurements of the deposition rate as a function of the spot size indicate that the decomposition occurs in the adsorbed phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343423
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  • 10
    Electronic Resource
    Electronic Resource
    Poincaré gauge invariant spinor theory and the gravitational field. II (1973)
    Springer
    General relativity and gravitation 4 (1973), S. 29-52 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nonlinear equation for an abstract noncanonical 2-component Weyl spinor field — as used with the inclusion of internal symmetries in Heisenberg's nonlinear spinor theory of elementary particles — which is invariant under scale, phase, and Poincaré transformations is modified in such a way as to become invariant under spacetime dependent phase gauge and Poincaré gauge transformations. In such an equation a phase gauge field B m , six Lorentz gauge fields A[κλ]m and four translation gauge fields gμm have to be introduced. It is demonstrated that all these fields can be identified as certain combinations of the Weyl spinor field, and hence should be considered in a rough sense as ‘bound states’ of this spinor field. In particular the ‘electromagnetic field’ Bm and the ‘gravitational field’ g μm appear as S-states and P-states of a spinor-antispinor system. The noncanonical property and the operator character of the spinor field is essential for this result. The relation between the translation gauge field and the spinor field involves a fundamental length. In a classical geometrical interpretation this relation leads to Einstein's equation of gravitation without cosmological term in a Riemannian space without torsion if the fundamental length is identified with Planck's length. It is shown that this equation is covariant under the larger symmetry group of phase gauge and Poincaré gauge transformations. The modified nonlinear equation constructed solely from a single 2-component Weyl field hence seems to incorporate in an extremely compact way ‘electromagnetic’ and ‘gravitational’ interaction in addition to non-mass-zero interactions. In this equation no arbitrary dimensionless constants enter. The considerations can be generalized to Dirac spinor fields and to spinor fields involving additional interior degress of freedom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769759
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