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  • 1
    Electronic Resource
    Electronic Resource
    Very-low-energy collision-induced rotational relaxation: a theoretical analysis (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 2021-2025 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100235a001
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  • 2
    Electronic Resource
    Electronic Resource
    Inelastic He scattering from a xenon overlayer: Dynamical diffraction effects (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7556-7563 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A model study is presented which describes the interaction of a gas with a crystalline surface. Both the surface and gas are treated quantum mechanically using a type of mean field approximation for the coupling of the translating particles to the surface. By varying the angle of incidence of the incoming particle, a large diffraction effect is observed for a narrow range of angles. Significant differences between the static and thermal features of the gas–surface scattering are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456189
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  • 3
    Electronic Resource
    Electronic Resource
    Time-dependent calculations of molecular photodissociation resonances (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2571-2577 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The molecular photodissociation dynamics of a model, collinear CO2 system is investigated using the time-dependent wave packet method. Resonance structures in the absorption line shape, found previously in time-independent studies, are correlated to particular oscillatory motions in the dissociating wave packet dynamics. Dramatic changes in the absorption line shape are predicted for this system for short pulse excitation due to the removal of the effects of one class of resonances. Three different methods of solving the time-dependent Schrödinger equation were tested and the optimal scheme was used in these calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459833
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  • 4
    Electronic Resource
    Electronic Resource
    Micromagnetic simulations of submicron cobalt dots (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5514-5516 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical simulations of submicron Co extruded elliptical dots were performed to illustrate the relative importance of different physical parameters on the switching behavior in the easy direction. Shape, size, magnetic moment magnitude, and the magnitude and distribution of the crystalline anisotropicity were varied. The simulation represents magnetostatic, exchange, and crystalline anisotropicity fields on a structured mesh using finite difference techniques. The smooth boundary of the dots is accurately represented by use of the embedded curve boundary method. Agreement with experimental hysteresis measurements of submicron dot arrays is obtained when an appropriate angular distribution of the grain anisotropicity axes is invoked. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373389
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  • 5
    Electronic Resource
    Electronic Resource
    Nucleation and annihilation of magnetic vortices in submicron-scale Co dots (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1395-1401 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe experiments on arrays of polycrystalline Co structures fabricated by interference lithography. The dots are thin (15–40 nm), submicron in size, and are patterned with a uniaxial, in-plane, shape anisotropy axis. We use magnetic force microscopy (MFM) in the presence of an applied field to directly observe magnetic reversal in the dots. These experiments reveal that reversal occurs predominantly through the nucleation and annihilation of a single magnetic vortex in each dot. Hysteresis loop measurements indicate that the vortices are stable over a wide range of applied fields and that the limits of this range depend on the size and thickness of the dots. Using the MFM data, we determine the statistical distribution of the single-vortex nucleation field for several different arrays. We attribute the observed variance to the random orientation of the polycrystalline grains. Finally, we show that the average vortex nucleation and annihilations fields are linearly correlated to the demagnetization field of a uniformly magnetized structure. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372026
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  • 6
    Electronic Resource
    Electronic Resource
    Spectral characterization of a Sn soft x-ray plasma source (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3332-3336 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The radiative emission from a soft x-ray laser-produced plasma source is examined in detail for the particular case of a Sn solid target under moderate illumination conditions: 1010–1012 W/cm2. The prominent spectral features which contribute to the relatively large conversion efficiency in the range 124–155 A(ring) are identified using extensive multi-configuration Dirac–Fock calculations. These data are used to generate synthetic spectra with plasma characteristics derived from a two-dimensional simulation of the ablating, radiating plasma. The comparison to the experimental results is generally favorable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357455
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  • 7
    Electronic Resource
    Electronic Resource
    Conversion efficiencies from laser-produced plasmas in the extreme ultraviolet regime (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2251-2258 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The conversion efficiency of spectral emission from laser-irradiated solid targets was investigated for short wavelength source development. The plasma brightness was quantified using absolutely calibrated detectors for 20 materials and spectra were obtained between 50 and 200 A(ring). Laser parameters such as wavelength, pulse length, intensity, and spot size were systematically varied to establish a comprehensive database for source optimization. Qualitative differences in the underlying dominant emission features as a function of atomic number and laser wavelength were observed that accounted for the relatively high spectral conversion efficiencies produced. In the specific case of Sn, a conversion efficiency greater than 0.8%/eV has been observed in the technologically important region of λ=134.0 A(ring) using a laser intensity of 1–2×1011 W/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361149
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of base pressure on FeMn exchange biased spin-valve films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4933-4935 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of base pressure, Pb, on physical properties of FeMn exchange biased spin-valve films was studied by varying Pb over two decades from 3×10−8 to 7×10−6 Torr. Giant magnetoresistive value shows a slight increase with increasing Pb until a large decrease occurs at Pb〉3.3×10−6 Torr. Exchange bias field and blocking temperature remain constant in the base pressure range between 3×10−8 and 5×10−7 Torr before a large reduction appears. Our results indicate an upper limit for base pressure, uPb(approximate)5×10−7 Torr, above which significant spin-valve performance modification and deterioration in the crystallographic texture begin as a result of the contamination both at the ferromagnetic/antiferromagnetic interface and in the bulk of FeMn layer. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373207
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  • 9
    Electronic Resource
    Electronic Resource
    Spectral emission diagnostics using oxygen impurities in optically thin plasmas (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1998-2006 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Emission from oxygen in the vacuum ultraviolet (VUV) spectral range from 140 to 260 A(ring) is evaluated as a diagnostic for optically thin plasmas. A one-dimensional Lagrangian, two-fluid hydrodynamic simulation code, which is self-consistently coupled to a comprehensive atomic rate equation model is used for the analysis. This model with the associated atomic rates is described and compared to recent data from laboratory experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860053
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  • 10
    Electronic Resource
    Electronic Resource
    Flow: A two-dimensional time-dependent hydrodynamical ion extraction model (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1447-1456 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The simulation of ion extraction from a quasineutral plasma is described using a two-dimensional time-dependent numerical fluid equation code, flow. Ion motion is treated using the cold ion continuity and momentum conservation equations in the potential field of complex structures. An upwind differencing scheme in Cartesian coordinates is used to solve these fluid equations. The plasma electrons are modeled as having a Maxwell–Boltzmann distribution, which allows for ion acoustic effects inside the plasma. The growth and evolution of two-dimensional ion sheaths is treated while evaluating the ion flux collected on the extractor surface. It is found that spatial grids very much coarser than the Debye length (of order ten times larger or greater) can be successfully used to accurately model ion extraction. Although the transition region between the high density quasi-neutral plasma and the ion sheath is not resolved, the ion flux across this region is still obtained correctly. The assumption of a Maxwell–Boltzmann distribution for the electrons requires the solution of a highly nonlinear Poisson equation. Previous approaches to this problem have relied upon a Newton–Raphson root search with standard iterative techniques for the resulting linearized equations. A new methodology is described here using the recently developed strongly implicit procedure (SIP), which has been optimized for the discretized two-dimensional Laplace operator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860055
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