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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Photodissociation near a rough metal surface: Effect of reaction fields (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 9106-9112 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The modification of the photochemical dissociation rate of molecules in the presence of a rough metal surface is explored. Classical electromagnetic calculations are presented for the photodissociation rate of a point dipole near a rough surface modeled as a hemispheroidal bump on a semi-infinite flat plane. A correction is introduced by accounting for the reaction fields due to the dipole–substrate system radiating photons and coupling to delocalized surface plasmons. The effects of the shape and size of the bump, and the separation of the molecule from the bump on the rate of photodissociation of the molecule, are studied numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459201
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photochemistry near a semiconductor surface (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 746-752 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A numerical study of photochemistry near a rough InSb surface, whose roughness is modeled as a spheroidal bump protruding out of the substrate plane, has been carried out. The semiconducting nature of the substrate is taken into account via a model dielectric function. "Shape resonance'' effects through the resonant coupling of the bump excitations to photons and various substrate modes (plasmons, phonons, etc.) are calculated and included in the study. Unlike in the case of a metal surface, radiation damping as well as damping due to adsorbate–substrate coupling are seen to play a minor role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464621
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A shape-optimization technique for the capillary surface problem (1990)
    Springer
    Numerische Mathematik 58 (1990), S. 737-757 
    Details
    ISSN: 0945-3245
    Keywords: AMOS(MOS): 49A22 ; 58E12 ; 65M60 ; CR: G1.8.G1.6
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The problem of the construction of an equilibrium surface taking the surface tension into account leads to “Laplace-Young” equation which is a nonlinear elliptic free-boundary problem. In contrast to Orr et al. where an iterative technique is used for direct solution of the equation for problems with simple geometry, we propose here an alternative approach based on shape optimization techniques. The shape of the domain of the liquid is varied to attain the optimality condition. Using optimal control theory to derive expressions for the gradient, a numerical scheme is proposed and simple model problems are solved to validate the scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01385652
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    Paper (German National Licenses)
    Fulltext
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