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  • American Institute of Physics (AIP)  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscopy of the surface topography and surface etching of nanoscale structures on the high-temperature superconductors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2760-2763 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the use of the scanning tunneling microscope (STM) for etching both single crystal and thin film, YBa2Cu3O7−x. Nanoscale features can be generated with the STM by ablation of atoms rastered by the microscope tip. The etching process can be controlled to remove layers of material which are multiples of the c axis (12 A(ring)). Various geometric features have been fabricated ranging from fine lines to square etch pits. The STM has also been used to study the growth mechanism and surface topography of thin films of YBa2Cu3O7−x produced by in situ laser deposition (Jc typically 1×106 A cm−2 at 77 K). Step features equal to the c axis of the material can be readily identified which form pinnacles or chip like morphologies at the surface. These surfaces can also be etched with the STM to reveal a more continuous substructure consistent with the high Jc's observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350351
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  • 2
    Electronic Resource
    Electronic Resource
    Incubation: Subthreshold ablation of poly-(methyl methacrylate) and the nature of the decomposition pathways (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2975-2978 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of the decomposition of poly-(methyl methacrylate) (PMMA) by pulsed UV laser ablation in the incubation regime is presented here. We propose that incubation proceeds via the photoinduced formation of defects centers; while ablation following incubation, at subthreshold fluences, is a thermally driven phenomena. The light scattering data, in the incubation regime, is consistent with molecular weight reduction via backbone cleavage. The defect centers, C(Double Bond)C at chain ends following backbone cleavage, increase the UV absorption coefficient thereby lowering the ablation threshold. Similarities between the mass spectra of ablative PMMA following incubation and pyrolysis suggest that ablation following incubation is thermally driven. The implications of these results in an extensive and contradictory body of available data are discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288501
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental test of induced rigidity (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1548-1552 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recent theoretical models for the nematic phase of semiflexible polymer chains predict a strong coupling between order and the conformational degrees of freedom of the chain. The presence of order in the nematic phase results in a strong preference for linear or rod-like conformations over flexible, random coil conformations. This conformational selection or induced rigidity is predicted to be general phenomenon associated with semiflexible chains. We have tested these predictions using a soluble polydiacetylene (4BCMU) as a probe. The 4BCMU chain undergoes a conformational transition (rod–coil) as a function of temperature in toluene which is accompanied by a large change in optical properties allowing the conformational transition to be followed spectroscopically in extremely dilute solutions. 4BCMU is miscible with both isotropic and nematic solutions of poly-(n-hexyl isocyanate) in toluene. If current models of induced rigidity are accurate, there should be a large shift in the transition temperature for the 4BCMU transition in nematic poly-(n-hexyl isocyanate) solutions. Experimentally we find no shift in the transition for nematic solutions when compared to dilute isotropic solutions. Possible explanations for the discrepancy between theory and experiment are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452193
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