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  • American Institute of Physics (AIP)  (17)
  • 2010-2014  (3)
  • 1990-1994  (9)
  • 1985-1989  (5)
  • 1
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    Interplay of light transmission and catalytic exchange current in photoelectrochemical systems (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-10-28
    Description: We develop an analytic current-voltage expression for a variable junction photoelectrochemical (PEC) cell and use it to investigate and illustrate the influence of the optical and electrical properties of catalysts on the optoelectronic performance of PEC devices. Specifically, the model enables a simple, yet accurate accounting of nanostructured catalyst optical and electrical properties through incorporation of an optical transmission factor and active catalytic area factor. We demonstrate the utility of this model via the output power characteristics of an exemplary dual tandem solar cell with indium gallium phosphide and indium gallium arsenide absorbers with varying rhodium catalyst nanoparticle loading. The approach highlights the importance of considering interactions between independently optimized components for optimal PEC device design.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    UN’s Basic Space Science Initiative: A follow-up report (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-30
    Print ISSN: 0031-9228
    Electronic ISSN: 1945-0699
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Multiple re-encounter approach to radical pair reactions and the role of nonlinear master equations (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-06
    Description: We formulate a multiple-encounter model of the radical pair mechanism that is based on a random coupling of the radical pair to a minimal model environment. These occasional pulse-like couplings correspond to the radical encounters and give rise to both dephasing and recombination. While this is in agreement with the original model of Haberkorn and its extensions that assume additional dephasing, we show how a nonlinear master equation may be constructed to describe the conditional evolution of the radical pairs prior to the detection of their recombination. We propose a nonlinear master equation for the evolution of an ensemble of independently evolving radical pairs whose nonlinearity depends on the record of the fluorescence signal. We also reformulate Haberkorn's original argument on the physicality of reaction operators using the terminology of quantum optics/open quantum systems. Our model allows one to describe multiple encounters within the exponential model and connects this with the master equation approach. We include hitherto neglected effects of the encounters, such as a separate dephasing in the triplet subspace, and predict potential new effects, such as Grover reflections of radical spins, that may be observed if the strength and time of the encounters can be experimentally controlled.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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  • 4
    Electronic Resource
    Electronic Resource
    Evaluation of the minority carrier diffusion length and edge surface-recombination velocity in GaAs p/n solar cells (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2919-2922 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hole minority carrier diffusion length (Lp) and the edge surface-recombination velocity (Vs) were measured as a function of distance (x) from the p-n junction in GaAs p/n concentrator solar cells. The measured Vs values were used in a theoretical expression for the normalized electron beam-induced current. A fit of the experimental data was used to determine Lp. Lp measured in irradiated cells showed a marked reduction as compared to the unirradiated cells. Our results were compared to results obtained in previous studies that did not account for Vs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351494
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  • 5
    Electronic Resource
    Electronic Resource
    Pressure tuning of Fermi resonance in crystal CO2 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3869-3876 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A solid state theory on pressure tuning of Fermi resonance in crystals is presented and applied to the CO2 case. The theory relies on consideration of delocalized ω2+ω2 two-phonon states anharmonically coupled to ω1 and it is developed along the formalism of the Green function technique. This gives a straightforward method to split bound states (or biphonons) out of the continuum. Explicit expressions for their energy separation and intensity are obtained. Calculations are performed on the pressure dependence of the main parameters governing the Fermi resonance and discussed in terms of the crystal approach. In contrast with the more limited molecular treatment, W is seen to decrease with pressure. The effect is specifically related to the spread of the two-phonon continuum over a finite energy interval. Other quantities, for instance the intensity ratio between bound states, do not suffer such a big discrepancy between the two models. Limits of applicability of our approach are also sketched.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456871
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  • 6
    Electronic Resource
    Electronic Resource
    Standing light wave in front of a silver mirror investigated by photothermal spectroscopy (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 892-894 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photothermal spectra of an isocyanine dye monolayer, separated from a silver mirror by a varying number of cadmium arachidate layers, are recorded with a pyroelectric calorimeter. The spatial dependence of the light intensity in front of the silver mirror is observed. The phase angle of a light wave upon reflection from the silver surface is determined to be 124±5° at a wavelength of 578 nm. The quantum yield for radiationless deexcitation at that wavelength is found to be 33±7%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98846
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  • 7
    Electronic Resource
    Electronic Resource
    Singularities of the one- and two-point mass gravitational lens (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 4093-4111 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A detailed study of when a change in the number of caustics and cusps occurs for one- and two-point mass gravitational lens lying on a single plane with continuously distributed matter and an external shear are presented herein. The equations for the positions of the cusps generated by such lens systems are investigated in detail. This method is based on a new approach using complex quantities and applies recent results on cusp counting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530029
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  • 8
    Electronic Resource
    Electronic Resource
    Quantum efficiencies exceeding unity due to impact ionization in silicon solar cells (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2405-2407 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Absolute measurements demonstrate internal quantum efficiencies in silicon solar cells to exceed unity for photon energies above the first direct band gap and to show distinct spectral features that correspond to specific points in the Brillouin zone. Ultraviolet radiation can generate hot carriers with sufficient energy to cause impact ionization which results in two electron hole pairs per incident photon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110489
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of the self-energy of a droplet interacting via a Yukawa force (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 2138-2140 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The binding energy of a homogeneously charged, classical droplet is considered, whose charge elements interact via a Yukawa force. The six-dimensional self-energy integral is reduced to a three-dimensional integral for axially symmetric, but otherwise arbitrarily shaped, droplets. This integral is brought into a form particularly convenient for numerical calculations. Two integrals involving products of Bessel functions are evaluated, which are either not listed in standard tables of integrals or given in an erroneous form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526836
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  • 10
    Electronic Resource
    Electronic Resource
    On the interpretation of phase measurements of oscillatory thermocapillary convection in liquid bridges (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2117-2120 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In their study of time-dependent thermocapillary convection in cylindrical liquid bridges Velten et al. [Phys. Fluids A 3, 267 (1991)] determined the azimuthal flow structure by measuring the phase of the temperature oscillations at three different azimuthal angles. Their explanation of the data in terms of modes with wave number m=0 is not always compatible with the normal-mode decomposition of the disturbances at the threshold. A new interpretation is given that explains the peculiar phase measurements in terms of pairs of m≠0 counterpropagating waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858551
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