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  • American Institute of Physics (AIP)  (19)
  • 1990-1994  (19)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Infrared spectroscopy and secondary ion mass spectrometry of luminescent, nonluminescent, and metal quenched porous silicon (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2423-2428 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Porous silicon with varying optical properties (luminescent, nonluminescent, and metal quenched) is investigated by transmission infrared (IR) spectroscopy and secondary ion mass spectrometry (SIMS). SIMS and transmission IR data are presented which show a lack of correlation between the optical properties of similarly prepared luminescent and nonluminescent porous silicon samples and the concentrations of the chemical elements and bonds detected therein. Similar results are obtained for a comparison of IR spectra before and after dissolving the topmost layers (∼2000 A(ring)) of a luminescent sample in a KOH solution, exposing the nonluminescent porous material below. Finally, IR and SIMS results for luminescent porous silicon quenched by metal ion solutions show a large increase in oxygen after quenching, but it is argued that the increased oxygen is unlikely to be directly responsible for the quenching of luminescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357591
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  • 2
    Electronic Resource
    Electronic Resource
    Surface waves in closed basins under principal and autoparametric resonances (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1635-1648 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The method of multiple scales is used to analyze the nonlinear response of the surface of a liquid in a cylindrical container to a principal parametric resonant excitation in the presence of a two-to-one internal (autoparametric) resonance. Four autonomous first-order ordinary-differential equations are derived for the modulation of the amplitudes and phases of the two modes involved in the internal resonance when the higher mode is being excited by a principal parametric resonance. The modulation equations are used to determine the periodic oscillations and their stability. The force-response curves exhibit the jump and saturation phenomena as well as a Hopf bifurcation, whereas the frequency-response curves exhibit the jump phenomenon and supercritical and subcritical Hopf bifurcations. Limit-cycle solutions of the modulation equations are found between the Hopf frequencies; they correspond to aperiodic motions of the liquid surface. All limit cycles deform and lose stability by either pitchfork or cyclic-fold bifurcations as the excitation frequency or amplitude is varied. The pitchfork bifurcation breaks the symmetry of the limit cycles whereas the cyclic-fold bifurcation causes cyclic jumps, which may result in a transition to chaos. Period-three motions are found in a very narrow range of the excitation frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857571
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  • 3
    Electronic Resource
    Electronic Resource
    Behavior of porous silicon emission spectra during quenching by immersion in metal ion solutions (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1141-1143 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photoluminescence emission of porous silicon was regularly measured while immersed in dilute metal ion solutions of Cu, Ag, and Au. The emission spectra show progressive quenching that advances from the blue edge towards the red edge of the emission band, causing a continuous shift in the band center and a narrowing of its width. Auger electron spectroscopy data show that the penetration of the metal adsorbate into the porous layer correlates with the degree of quenching of the photoluminescence. These results are interpreted as a progression of the quenching of the photoluminescence inward from the surface of the sample toward the bulk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110832
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  • 4
    Electronic Resource
    Electronic Resource
    Quenching of porous silicon photoluminescence by deposition of metal adsorbates (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4783-4785 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Various metals were deposited on luminescent porous silicon (PS) by immersion in metal ion solutions and by evaporation. The photoluminescence (PL) was quenched upon immersion in ionic solutions of Cu, Ag, and Au but not noticeably quenched in other ionic solutions. Evaporation of 100 A(ring) of Cu or 110 A(ring) of Au was not observed to quench PL. Auger electron spectroscopy performed on samples quenched and then immediately removed from solution showed a metallic concentration in the PS layer of order 10 at.%, but persisting to a depth of order 3000 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354350
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  • 5
    Electronic Resource
    Electronic Resource
    Strong-field effect in nanofabrication on chemically prepared silicon (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4721-4723 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the uniformity of scanning tunneling microscope nanofabrication on as-prepared chemically etched silicon. Our results show that continuous fabrication produces isolated nanoscale dots along the motion of the tip rather than uniform lines. These results are discussed with the aid of a self-limiting strong-field effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352746
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  • 6
    Electronic Resource
    Electronic Resource
    Nanofabrication with a scanning tunneling microscope (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2970-2974 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanometer-scale structures as small as 1 nm were fabricated on graphite surfaces using a scanning tunneling microscope in the presence of low-pressure (10−4 Torr) trimethylaluminum. The studies were performed under controlled conditions of gas purity and gas pressure, allowing systematic measurements. We studied the voltage threshold and other features of the fabrication process as a function of the tip-surface biasing voltage and the tunneling current. The studies lead us to believe that the structures were formed by bombardment of the graphite surface by ions produced by electron-assisted field ionization localized in the region of the tunneling gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348609
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  • 7
    Electronic Resource
    Electronic Resource
    Structural and magnetic studies of the alloy system GdAg1−xFex (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1893-1895 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of structural and magnetic studies of the alloy series GdAg1−xFex for x=0.0, 0.1, 0.2, and 0.3. The structural study indicates that this alloy is not single phase for all values of x, but rather consists of three phases: the cubic disordered (A2) GdAg phase, the hexagonal α-Gd phase, and the cubic (MgCu2-type) GdFe2 phase. The magnetic measurements confirm the existence of these phases. The Néel temperature for the GdAg phase is TN≈140 K, the Curie temperature for the α-Gd phase is TC≈300 K, and the Curie temperature for the GdFe2 phase is TC≈820 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351176
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of suction on the subharmonic instability of compressible boundary layers (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2179-2190 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of self-similar suction distributions on the subharmonic instability of a two-dimensional (2-D) compressible boundary layer over an insulated flat plate is analyzed using the Floquet model. The resulting problem is solved numerically by using finite differences. Results are presented for different Mach numbers. For supersonic flows results for first- and second-mode primary waves are presented. It is found that when the primary wave is a first mode, suction stabilizes the subharmonic wave at low and moderate Mach numbers. However, at high Mach numbers suction loses its effectiveness. When the primary wave is a second mode, suction is also found to stabilize the subharmonic mode. When the primary wave is a first mode merging with a second mode, the subharmonic wave is strongly destabilized by suction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857899
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  • 9
    Electronic Resource
    Electronic Resource
    Subharmonic instability of compressible boundary layers (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1380-1392 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The subharmonic instability of a two-dimensional compressible boundary layer over an insulated flat plate is analyzed using the Floquet model. The resulting problem is solved numerically by using both finite differences and the computer code suport. Results are presented for subsonic, transonic, and supersonic flows. For supersonic flows results for the first and second modes are presented. The effects of Mach number, spanwise wave number, amplitude of the primary wave, Reynolds number, and frequency are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857587
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of wall cooling on the stability of compressible subsonic flows over smooth humps and backward-facing steps (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 381-389 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of wall cooling on the two-dimensional linear stability of subsonic flows over two-dimensional surface imperfections is investigated. Results are presented for flows over smooth humps and backward-facing steps with Mach numbers up to 0.8. The results show that, whereas cooling reduces the viscous instability, it increases the shear-layer instability and hence it increases the growth rates in the separation region. The coexistence of more than one instability mechanism makes a certain degree of wall cooling most effective. For the Mach numbers 0.5 and 0.8, the optimum wall temperature is about 80% of the adiabatic wall temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857788
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