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  • Articles: DFG German National Licenses  (33)
  • 2005-2009
  • 1990-1994
  • 1985-1989  (33)
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  • 1987  (33)
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  • Articles: DFG German National Licenses  (33)
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  • 2005-2009
  • 1990-1994
  • 1985-1989  (33)
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  • 1
    Electronic Resource
    Electronic Resource
    Oriented growth of niobium and molybdenum on GaAs crystals (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 466-473 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin layers of Mo and Nb, 100–400 A(ring) thick, were deposited onto clean (100) and (1¯1¯1¯)GaAs substrates under ultrahigh vacuum conditions in a molecular-beam epitaxy system, at slow rates and at relatively low temperatures. The microstructure of the films and the orientation relationship with the substrates were determined by in situ reflection high-energy electron diffraction, by transmission electron microscopy, and by grazing-incidence x-ray diffraction. In spite of the large lattice mismatch to GaAs (11% for Mo and 17% for Nb) and the low deposition temperatures(〈400 °C), oriented deposits were obtained on both substrates for both metals. Although both metals are body-centered cubic with similar lattice parameters, and are both of similar chemical behavior, they grow differently on GaAs. Molybdenum grows epitaxially in the (111) orientation on both (100) and (1¯1¯1¯)GaAs substrates, whereas niobium grows with the (100) orientation on (100)GaAs, and with no simple orientation on (1¯1¯1¯)GaAs. In both cases, the orientational spread (deduced from the diffraction patterns) is smallest when the lattice planes parallel to the interface have the same symmetry in film and substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339768
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum confinement effects of semiconducting microcrystallites in glass (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 5399-5409 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical properties of glasses containing a small amount of thermally developed CdSexS1−x microcrystalline phase are studied with emphasis on quantum confinement effects exhibited at small crystallite size. Optical absorption, photoluminescence, x-ray diffraction, and transmission electron microscopy are used to examine microcrystallites as a function of composition and development. Results are presented for a series of commercially available CorningR filter glasses with a selenium mole fraction in the range 0.28≤x≤0.74, as well as for several experimental glasses in which the average microcrystallite diameters range from 30 to 80 A(ring). Optical effects observed in the experimental glasses that are due to electron and hole confinement are not present in the filter glasses considered; variations in optical properties of the filters are due to changes in stoichiometry of the CdSexS1−x mixed anion system. A brief discussion of other microcrystalline phases in glass is also presented. These microcrystallites show room-temperature optical absorption structure analogous to bulk crystal excitons; the temperature dependence of this structure is contrasted with that resulting from quantum confinement in CdSexS1−x glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338280
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  • 3
    Electronic Resource
    Electronic Resource
    Proposal for strained type II superlattice infrared detectors (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2545-2548 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that strained type II superlattices made of InAs-Ga1−xInxSb x∼0.4 have favorable optical properties for infrared detection. By adjusting the layer thicknesses and the alloy composition, a wide range of wavelengths can be reached. Optical absorption calculations for a case where λc∼10 μm show that near threshold the absorption is as good as for the HgCdTe alloy with the same band gap. The electron effective mass is nearly isotropic and equal to 0.04 m. This effective mass should give favorable electrical properties, such as small diode tunneling currents and good mobilities and diffusion lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339468
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  • 4
    Electronic Resource
    Electronic Resource
    Transient photoconductive response of InP:Fe (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 234-239 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present experimental transient response data for iron-doped indium phosphide (InP:Fe) photoconductors subject to impulse and rectangular-pulse excitation over a wide range of excitation intensities. The detector response shape is observed to depend strongly on the excitation intensity. We present a model for bulk-material response based on the dynamics of electron and hole trapping and recombination on the deep-level iron impurities. The model qualitatively reproduces the observed experimental behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338862
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Vibronic coupling in polyenes: High resolution optical spectroscopy of all-trans-2,4,6,8,10,12,14-hexadecaheptaene (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3360-3365 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High resolution fluorescence and fluorescence excitation spectra of all-trans-2,4,6,8,10,12,14-hexadecaheptaene have been obtained in n pentadecane at 10 K. The most prominent vibronic features, like those in spectra of shorter polyene hydrocarbons, are due to combinations of symmetric carbon–carbon stretching vibrations. These in turn are dominated by a double bond mode whose frequency increases from 1555 to 1782 cm−1 upon electronic excitation (1 1Ag→2 1Ag). This 227 cm−1 increase, the largest yet observed in polyene spectroscopy, can be explained by vibronic coupling between the ground and first excited singlets. The possible role of vibrational mixing due to mutual polarizibilities between carbon–carbon bonds also is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452978
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of premeditation on the occurrence of dysrhythmias during oral surgery (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 42 (1987), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The incidence of cardiac dysrhythmia during inpatient dental anaesthesia with enflurane was studied following either hyoscine or droperidol as a supplement to papaveretum premedication. None of the subgroup given droperidol exhibited dysrhythmias, compared to 4.4% of those patients given hyoscine. This difference was not significant at the 5% level (0.2 〉 p 〉 0.1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1987.tb04118.x
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  • 7
    Electronic Resource
    Electronic Resource
    Tracheopathia osteochondroplastica (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 42 (1987), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 60-year-old man presented for aortocoronary saphenous vein grafting; tracheal intubation was found to be difficult before surgery. Bronchoscopy at the time suggested tracheal carcinoma, but subsequent biopsy of the trachea demonstrated tracheopathia osteochondroplastica. The condition is described and its implications for anaesthetists are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1987.tb04049.x
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  • 8
    Electronic Resource
    Electronic Resource
    The Wind Farms of the Altamont Pass Area (1987)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Environment and Resources 12 (1987), S. 145-183 
    Details
    ISSN: 0362-1626
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.eg.12.110187.001045
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  • 9
    Electronic Resource
    Electronic Resource
    Studies of chemical reactivity in the condensed phase. III. Direct measurement of predissociation and geminate recombination times for iodine in solution (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2709-2715 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results are presented which clarify the time scales for predissociation and geminate recombination in the iodine photodissociation/recombination reaction. Direct comparison of absorption features following A state excitation with those following B state excitation suggests that predissociation may be much more rapid (≤1 ps) than previously thought, and that geminate recombination is also very rapid (≤2 ps). Both of these results lead to the conclusion that curve crossing in solution is extremely facile and not the rate-limiting step in recombination. An important consequence of this is that molecular dynamics simulations seem to give reasonable results for recombination dynamics even when curve crossing is treated by oversimplified models. Finally, it is shown that in order to properly interpret the early time bleach kinetics it is necessary to consider dynamics within the ground state population remaining after excitation as well as excited state dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453058
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  • 10
    Electronic Resource
    Electronic Resource
    Adaptation of lnstron to Determine the Surface Tension of Ice Cream Mix (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 52 (1987), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A study was conducted to compare surface tension values measured by the DuNouy Method using the Cahn Electrobalance (an accepted procedure) with a procedure developed for use with an Instron. Surface tension was measured on a standard ice cream mix. Results indicate that the method developed for the Instron gave results which were not only similar to the Cahn Electrobalance procedure but also more precise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1987.tb14294.x
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