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  • 1
    Electronic Resource
    Electronic Resource
    Segmental dynamics and relaxation of n-octane at solid–liquid interfaces (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8444-8453 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we present our results from a molecular dynamics study of n-octane liquids confined between planar bcc solid surfaces. The systems studied were wide enough to develop a bulklike region throughout the middle portion of the film and two well-separated interfaces. Our work focused on segmental dynamics and relaxation of "adsorbed'' octane molecules. In particular, we investigated the role of architectural and dynamical features peculiar to short chain molecules (almost fixed bend angles and restricted torsional rotations) on the dynamics of "adsorbed'' chains. We found that the relaxation of octane molecules exhibits the same qualitative trends as those observed in molecular simulations of generic "bead-spring'' oligomer films. The most important effect is the dramatic slow down of rotational motions (up to a factor of 1000) for chains adsorbed on strongly physisorbing surfaces (adhesion energy per segment of 1–2 kT). Despite the qualitative similarities with bead-spring chains, the dynamics of realistic short hydrocarbon chains are affected much more strongly by the interfacial environment than their bead-spring counterparts. These stronger effects originate largely from the suppression of torsional angle transitions inside the extremely dense first layer (in cases of strong physisorption). The frequency of torsional transitions was found to be correlated directly with the amount of "free volume'' available inside the crowded first layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466743
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  • 2
    Electronic Resource
    Electronic Resource
    Using synchrotron radiation x-ray multiple diffraction to examine the lattice coherency of semiconductor surfaces and epitaxial layers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3492-3498 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental facility for carrying out x-ray multiple diffraction (XRMD) studies in parallel-beam geometry using the Daresbury synchrotron radiation source and its application in the study of coherency of an epilayered sample are described. Experimental high-resolution Renninger scans (RS) about GaAs(006) are presented and the pseudoforbidden "Aufhellung'' eight-beam (000,006,020,042,044,026,02¯4,02¯2) case has been fully resolved for the first time using the setup which involves a double-crystal six-circle scattering geometry and data acquisition providing optimal conditions for these scans to be obtained. A sample of InGaAs/AlGaInAs/InP(001) epilayered material was also examined and high-resolution RS from the bulk, substrate, and epitaxial overlayers were obtained. The diffraction wavelength used was determined directly from the bulk RS as λ=(1.4695±0.0005) A(ring). The data clearly reveal a number of interesting XRMD features which allow for the sample characterization. The layer parallel lattice parameter can be determined either from the epilayer tetragonal distortion in the layer RS or from the MORSI (modulation of the RS intensity due to the presence of the epilayers) [Greenberg & Ladell, Appl. Phys. Lett. 50, 436 (1987)] dips in the substrate RS. These dips can also provide simultaneous information on relative tilt and rotation between both layer/substrate lattices. The fitting of the position and profile of the three-beam surface peaks allows the determination of the layer parallel lattice parameter and the layer mosaic spread on the sample surface plane. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361399
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  • 3
    Electronic Resource
    Electronic Resource
    Ion beam amorphization of YBa2Cu3Ox (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1462-1464 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure of ion-implanted thin films of the superconductor YBa2Cu3Ox has been investigated by transmission electron microscopy. The superconducting properties of the films were dominated by large pancake-shaped grains of YBa2Cu3Ox with their c axis perpendicular to the substrate. Other grains of YBa2Cu3Ox whose c axis was parallel to the substrate formed spherulites. Irradiation with 500 keV O+ ions caused amorphous zones to appear on the grain boundaries between the pancake grains, which initially were free of amorphous or second phases. At higher dose a continuous amorphous layer 150 A(ring) thick was formed. However, the interior of the grains showed no irradiation-induced microstructural features until they became amorphous at a dose of 3×1014 ions/cm2. The appearance of the amorphous layer on the grain boundaries at low doses accounts for the reduction in the superconducting transition temperature observed in these films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98658
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  • 4
    Electronic Resource
    Electronic Resource
    A continuous Monte Carlo method for growth and equilibration of polymer chains at high densities (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 634-637 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have developed an off-lattice Monte Carlo method for growth and equilibration of dense liquids consisting of polymer chains with realistic intramolecular architecture. Our technique is a continuous generalization of the lattice scheme developed by Kolinski et al. [J. Chem. Phys. 84, 1922 (1986)]. The method succeeded in growing alkane chains with chain length up to 25 at high liquid densities. Comparison with earlier molecular dynamics studies shows that our method produces fully equilibrated configurations of dense alkane liquids very efficiently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465091
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  • 5
    Electronic Resource
    Electronic Resource
    Five new experimental stations at the SRS Daresbury from a 6 T superconducting wiggler magnet : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1633-1635 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Daresbury Laboratory is currently completing the construction and commissioning of five new experimental research stations utilizing high flux hard x-ray radiation from a 6 T superconducting wiggler magnet. The broad areas of science covered by the new stations and the novel features are presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145867
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  • 6
    Electronic Resource
    Electronic Resource
    Design and performance of a focused beam line for surface x-ray diffraction : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1083-1086 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Focusing optics have been installed on the 5.0 T Wiggler beam line of the SRS at Daresbury Laboratory for use with x-ray diffraction measurements of surfaces and interfaces. A significant increase in the flux has been achieved without excessive degradation of the resolution in the vertical plane. The full width at half-maximum of the focused image compares well with the predictions of ray tracing analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143207
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  • 7
    Electronic Resource
    Electronic Resource
    Correlation between chemistry and the amount of mixing in bilayers submitted to ion bombardment (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 1426-1429 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments conducted with bilayers of elements so chosen as to maximize chemical differences and to minimize physical differences (e.g., atomic weights) demonstrate the importance of chemistry in determining the amount of interaction which results from ion mixing experiments. These results emphasize the dominance of chemical factors which are at least neglected, if not totally ignored, in the modeling of ion mixing effects. Ion bombardment of Pd/Hf bilayers causes the formation of Pd3Hf; the existence of such compounds was not detected in other bilayers of "similar'' elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334505
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of radiation damage in ion-implanted thin films of metal-oxide superconductors (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 139-141 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of ion implantation into thin films of the superconductor YBa2Cu3Ox have been studied. Using oxygen and arsenic ions, the superconducting transition temperature Tc, the change in room-temperature electrical properties from conducting to insulating, and the crystalline to amorphous structural transition in the films were studied as a function of ion dose. The deposited energy required to change Tc was found to be 0.2 eV/atom, while 1–2 eV/atom was required to affect the room-temperature conductivity, and 4 eV/atom to render the film amorphous. This hierarchy of effects is discussed in terms of the damage mechanisms involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98594
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  • 9
    Electronic Resource
    Electronic Resource
    Quantum interference devices made from superconducting oxide thin films (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 200-202 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated superconducting quantum interference devices (dc SQUID's) from thin films of the superconducting oxide YBa2Cu3Oy. The devices were made by first lithographically patterning an ion implant mask containing a 40 by 40 μm loop and two 17-μm-wide weak links over a ∼1-μm-thick oxide film. Ion implantation was then used to destroy the superconductivity in the film surrounding the device without actually removing material, resulting in a completely planar structure for the SQUID's. The SQUID's were operated in the temperature range from 4.2 to 68 K. The superconducting flux quantum was measured to be h/2e in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98922
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