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  • Institute of Physics  (108)
  • American Association for the Advancement of Science (AAAS)  (10)
  • American Institute of Physics (AIP)  (7)
  • Nature Publishing Group  (7)
  • Wiley-Blackwell
  • 2005-2009  (95)
  • 1985-1989  (40)
  • 2009  (95)
  • 1987  (40)
  • 1
    Electronic Resource
    Electronic Resource
    Time-of-flight x-ray photoconductivity of HgI2 (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 4308-4310 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-of-flight photoconductivity measurements were performed on HgI2 using a penetrating, pulsed x-ray source, simulating the operation of photoconductive x-ray detectors. By examining a variety of HgI2 samples, a wide range of electron and hole mobilities were observed, but in all cases hole transport was highly localized, limiting the collection of the photocarriers in HgI2 detectors. The intrinsic photocarrier generation and recombination processes differed from classical Onsager and Langevin mechanisms observed in low-mobility photoconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339059
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  • 2
    Electronic Resource
    Electronic Resource
    Intrusions in the active layer of channeled-substrate-planar laser diodes (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1093-1096 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Channeled-substrate-planar laser diodes from various wafers were observed to develop a node or dark spot in their near-field patterns after failure during lifetesting. "Node'' devices from each wafer were angle lapped and stained in an attempt to uncover a physical mechanism for this common failure symptom. Optical microscopic examination of the beveled cross sections revealed that an intrusion, in the form of a spike at the tip of the zinc diffusion front, had penetrated into the active layer of these diodes. The node observed in the near-field pattern appears to be in a position corresponding to the location of the spike in the active region. In addition, cathodoluminescence measurements on other "node'' diodes revealed a dark line region approximately 2 μm wide running parallel to and in the middle of the 5-μm contact stripe. We believe that this dark line region is representative of an area of nonradiative recombination which occurs in the portion of the active layer containing the intrusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339740
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  • 3
    Electronic Resource
    Electronic Resource
    Thin-film palladium and silver alloys and layers for metal-insulator-semiconductor sensors (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1074-1083 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The addition of Ag to Pd in the gate metal of a metal-insulator-semiconductor gas sensing diode can improve the performance and change the selectivity of the sensors for a variety of reactions. Data on the response of diodes with 12 different ratios of Ag to Pd in alloys and layers of Pd and Ag to hydrogen and other gases are reported. Diodes with as much as 32% Ag respond very well to H2 gas and the films are much more durable to high hydrogen exposure than pure Pd films. Improvements in the rate of response and aging behavior are found for certain Ag combinations; others give poorer performance. The presence of Ag on the surface changes the catalytic activity in some cases and examples of H2 mixed with O2 and/or NO2, propylene oxide, ethylene, and formic acid are given. Such selectivity forms the basis for miniature chemical sensor arrays which could analyze complex gas mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339738
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  • 4
    Electronic Resource
    Electronic Resource
    Electromagnetic resonance enhanced photoabsorption in planar metal–oxide–metal tunnel junction detectors (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2022-2029 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present calculations of surface plasmon and guided wave enhanced light absorption in the metal electrodes of planar aluminum–aluminum oxide–silver and aluminum–aluminum oxide–aluminum tunnel junctions. We consider excitation, under conditions of attenuated total reflection, of both the "fast'' and "slow'' surface plasmons of the junction, and of TE and TM guided modes supported by a dielectric film adjoining the junction. We find that 〉97% absorption may be obtained at resonance in a single electrode of a practical device, the thickness of which is only a fraction of the expected photocarrier mean free path, and show how the angular width of the absorption peak may be varied by changing the adjacent dielectric media. We also show how resonant absorption may be used in a biased planar device for the detection of radiation at normal incidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337999
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  • 5
    Electronic Resource
    Electronic Resource
    Spin-wave polarization in single domain uranium selenide (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3412-3414 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin waves in ferromagnetic USe have been measured by inelastic neutron scattering. Previous measurements on a multidomain USe sample show that the spin wave branch has a zone center frequency of ≈9 THz, and that the spin waves are intrinsically broad. New measurements on a single domain sample show that, in addition, the spin wave is unpolarized. This behavior is unlike that of a classical ferromagnet, in which the polarization is transverse, but similar to behavior observed in some singlet ground state systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338763
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  • 6
    Electronic Resource
    Electronic Resource
    Islands of stability and complex universality relations (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 60-63 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: For complex mappings of the type z→λz(1−z), universality constants α and δ can be defined along islands of stability lying on filamentary sequences in the complex λ plane. As the end of the filament is approached, asymptotic values αN∼λN−1∞, δN/α2N∼1 are attained, where μ∞=λ∞(λ∞−2)/4, is associated with the limiting form of the universal function for that sequence, g(z)=1−μ∞z2. These results are complex generalizations of the real mapping case (applying to tangent bifurcations and windows of stability) where μ∞=2 and δ/α2→ (2)/(3) correspond to the filament running along the real axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527808
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  • 7
    Electronic Resource
    Electronic Resource
    ESR study of optically enhanced phase transition in (BEDT–TTF)3Ta2F11 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1780-1788 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have identified an optically enhanced magnetic phase transition in the newly synthesized organic molecular charge transfer salt, (BEDT–TTF)3Ta2F11 (BEDT–TTF 3/4 bis-ethylenedithiolotetrathiafulvalene) by ESR absorption measurements in the X band microwave region. At room temperature, only a doublet state ESR absorption is observed, but below 30 K several triplet ESR absorptions appear. The orientation dependence of the ESR absorption under illumination at energies near the band gaps in the material (640 nm, T=12 to 5 K, H0〈0.34 T) indicates that there are rapid spin exchange processes with times τe〈10−8 s near 7 to 5 K along certain crystallographic directions with a temperature dependence suggesting spin-lattice relaxation times which proceed via Van Vleck "direct processes.'' This, to our knowledge, is the first case where the magnetic properties of a charge transfer salt are altered by the interaction with photons of energy equal to the band gaps in a low dimensional solid, providing a new, interesting way to investigate these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452178
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  • 8
    Electronic Resource
    Electronic Resource
    Unearthly exercises (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 210-210 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Astronomical Methods and Calculations. By Agnes Acker and Carlos Jaschek. Wiley: 1986. Pp.343. Hbk$34.95, £38.50; pbk$26.35, £14.95. SCIENCE is quantitative and astronomy is no exception. But astronomy has a special piquancy because the problem of measuring such fundamental ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/326210a0
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  • 9
    Electronic Resource
    Electronic Resource
    Tunable noise (1987)
    [s.l.] : Nature Publishing Group
    Nature 325 (1987), S. 489-489 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Nittmann and Stanley1 have introduced the concept of tunable noise to the dielectric breakdown model (DBM) growth process of Niemeyer et a/.2. Instead of adding to the growing structure at the first time a surface site is chosen, Nitt-man and Stanley introduce the additional condition that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/325489b0
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  • 10
    Electronic Resource
    Electronic Resource
    Cometary magnitude distribution and the fading of comets (1987)
    [s.l.] : Nature Publishing Group
    Nature 325 (1987), S. 231-232 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A series of observations of the apparent magnitude, m, of a specific comet fit well a formula of the type 231 m = //10 + 2.5 n log r + 5 log A (1) where r and A are the comet-Sun and comet-Earth distances and H10, the absolute magnitude, is a product of the fitting in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/325231a0
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