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  • 1
    Electronic Resource
    Electronic Resource
    Surface reactivity of luminescent porous silicon (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2094-2096 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of addition of a series of organoamine molecules on the luminescence of porous silicon has been examined by steady-state photoluminescence (PL) and Fourier transform infrared spectroscopies. These samples, prepared nonanodically via stain etching techniques and characterized by atomic force microscopy, show dramatic quenching of visible PL upon addition of dilute solutions of the above Lewis base adsorbates. The fractional changes in integrated PL intensity as a function of quencher concentration obey a simple equilibrium model, demonstrating Langmuir-type behavior from which equilibrium constants can be calculated. An observation concomitant with this loss of PL is a diminution of the silicon hydride stretching frequencies near 2100 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354754
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared multiphoton dissociation of styrene ions by low-power continuous CO2 laser irradiation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 5069-5075 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The kinetics of infrared multiphoton dissociation of styrene ions under collision-free conditions in the ion cyclotron resonance ion trap were studied as a function of the intensity of the cw CO2 laser at powers up to 6 W. Following the beginning of irradiation an induction time was observed, followed by dissociation according to a first-order rate constant. The kinetics could be fitted to a random-walk simulation of a master-equation model, in the same way as previous studies. A matrix-algebra solution of the master-equation model is described which gave a better fit with greater computational convenience. From the modeling the rate of radiation of infrared photons (assumed to be at 940 cm−1) from the ions was estimated as 350 s−1 at an ion internal energy of around 3 eV. When the dissociation threshold Et was treated as an unknown it was found that master-equation modeling of the kinetic results could give an estimate of Et, but with large uncertainty. Application of simple thermal kinetic theory via Tolman's theorem gave good qualitative understanding of the results, and predicted the intensity dependence of the dissociation rate with a deviation of about 30%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462860
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  • 3
    Electronic Resource
    Electronic Resource
    Radiation from an annular grating on a planar optical waveguide (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 3423-3425 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter discusses the radiation scattering properties of a concentric-circle grating on the surface of an optical waveguide. A boundary perturbation method is used to obtain an analytical expression for the field radiated by a set of concentric rings located at the film–cover interface of the waveguide. The analytical expression for the radiation field consists of a scattering integral which is integrated to predict the field's intensity at points in the far field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110160
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  • 4
    Electronic Resource
    Electronic Resource
    Radiation from concentric-circle grating, surface-emitting planar waveguides: The volume current method (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3077-3079 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter describes the volume current boundary perturbation method and uses this method to find the field radiated by a set of concentric rings located at the film-cover interface of a three-layer, planar optical waveguide. Waveguides with annular and full (extending from the origin) sets of circular gratings, and with both traveling and standing guided waves, are analyzed. The resulting analytical expression for the radiation field and far-field intensity patterns are compared with results of the field-expansion boundary perturbation method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111352
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