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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Archives of Biochemistry and Biophysics 298 (1992), S. 21-28 
    ISSN: 0003-9861
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Photochemistry and Photobiology A: Chemistry 80 (1994), S. 417-421 
    ISSN: 1010-6030
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Superlattices and Microstructures 15 (1994), S. 69 
    ISSN: 0749-6036
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2488-2494 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: If a modulation-doped AlGaAs/GaAs heterostructure is illuminated by light, photoexcitation of deep levels in the GaAs substrate leads to some interesting effects. Below 100 K, the heterostructure shows a persistent photoconductivity effect. Moreover, a strong persistent channel depletion is observed at low temperatures when a small negative voltage is applied to the substrate contact (backgate). The latter effect is explained by a double-layer model of GaAs where the GaAs side of the heterostructure consists of (1) a buffer layer and (2) a semi-insulating substrate. Under illumination, most of the applied negative voltage drops across the very thin buffer layer, and the enhanced electric field in the layer exerts a very strong influence on the conducting channel.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2358-2360 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transport crystal current density Jc has been measured in Bi2Sr2CaCu2Ox single crystals. With a voltage criterion of 1.0 μV/cm, current density measurements yield Jc values ranging from 300 to 1000 A/cm2 at 77 K and zero field, depending upon crystal quality. The crystals are grown by using a flux method and have a typical size of approximately 10×4×1.5 mm. X-ray diffraction, scanning electron microscopy, electrical resistivity, and magnetization shielding data are reported.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 4435-4439 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 8126-8135 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The interaction of H2 with Fe(111) has been studied by thermal energy atom scattering (TEAS). The specularly scattered He intensity as a function of hydrogen coverage exhibits a concave drop in scattered He intensity up to 30% coverage, followed by a plateau and another drop in intensity at 80% coverage. A model has been developed to account for this data which assumes three adsorption sites for H on Fe(111), in analogy with the three desorption peaks seen in temperature-programmed desorption (TPD). The adsorption sites have not been definitely assigned, but are labeled "deep–hollow,'' "shallow–hollow,'' and "on-top.'' Competitive adsorption into the deep-hollow and shallow-hollow sites is assumed to account for the initial concavity of the data. Adsorption into on-top sites only becomes significant at 80% coverage. Effective cross sections and reflectivities for the three sites have been obtained for θi=60° and 40°. When a H saturated surface is heated, the scattered He intensity decreases upon heating from 173 to 240 K, at which point desorption has already begun. This drop in intensity is not completely explicable by a Debye–Waller attenuation. It is proposed to be due to a shift in population of the adsorbed H to more exposed, on-top sites, in accord with a Boltzmann distribution of adsorption sites. The scattered He intensity increases upon further heating from 240 to 400 K, corresponding to the desorption of recombined H2 from the surface. Comparison of the He/H/Fe(111) system is made with the He/H/Pt(111) and He/H/Fe(110) systems.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 8120-8125 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The interaction of CO with Fe(111) has been studied by thermal energy atom scattering (TEAS) at surface temperatures of 250 and 400 K. The behavior of He scattering from both the clean and CO covered Fe(111) surface is different from that on smooth, close-packed surfaces such as Pt(111). Although the specular He intensity from the CO covered surface is not negligible, as it is on smooth surfaces, CO is seen to be a perfectly diffuse scatterer. A model to describe the scattering intensity as a function of CO coverage was developed which takes into account the He intensity scattered from the clean surface and the intensity scattered from the CO covered surface, with no interference effects. Effective cross sections of 56 A(ring)2 for He scattering from molecular CO and 93 A(ring)2 per molecule for He scattering from dissociated CO were obtained. Comparison of the He/CO/Fe(111) system is made with He/CO/Pt(111) and He/H/Pt(111) systems and clear differences are seen. As the temperature of the CO covered surface is increased there are two increases in scattered He intensity at ∼360 and 750 K, corresponding to the desorption of molecular and recombined CO, respectively. This study suggests that, although the interpretation of the data is more complicated than for smooth surfaces, TEAS is a viable technique for application to studies of adsorption on more corrugated surfaces.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1271-1274 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Infrared absorption line profiles associated with transitions between the 1s-like ground state and 2p− excited state of hydrogenic donors in a quantum well are calculated for x-polarized radiation. Various types of dopant distribution are considered as in the experimental studies. Similarity is drawn between the calculated quasi-Lorentzian line shapes and one derived from a transmission spectrum for a central 1/3 barrier doped multiple quantum well sample. Effects in a magnetic field applied perpendicular to the layers are also investigated and compared with experiment. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3023-3025 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on a chemical approach to fabricating double-barrier tunneling junction (DBTJ) for room-temperature single-electron tunneling studies, by which CdS nanoclusters were directly synthesized on a scanning tunneling microscopy (STM) tip through an organic self-assembled monolayer (SAM) and in situ chemical reaction. The SAM/CdS-modified STM tip directly establishes a DBTJ structure with highly oriented pyrolytic graphite substrate with STM-based current–voltage measurement. Clear Coulomb staircases were observed at room temperature with this experimental approach, and the reproducibility was nearly 90%. When gradually reducing the tip-substrate gap by increasing the setpoint current, the staircase width showed a gradual decrease from 320 to 180 mV. These phenomena are well described by semiclassical model for correlated single-electron tunneling. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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