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  • Articles: DFG German National Licenses  (63)
  • 1995-1999  (44)
  • 1985-1989  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Elementary Reactions of CF2(.lambda.lX) with O3 and O2 (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 10847-10852 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100027a027
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of subsurface damage in silicon by a combined photothermal and photoluminescence heterodyne measurement (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7548-7551 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nondestructive evaluation technique based on the detection of the real part of the excess charge carrier wave by photoluminescence in a frequency range from 5 kHz up to 12 MHz is introduced for semiconductor defect analysis. Crystalline imperfections in silicon due to wafer manufacturing and processing are investigated and the results are correlated with those obtained from conventional photothermal measurements. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365351
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  • 3
    Electronic Resource
    Electronic Resource
    Coherent and diffusive features of polaron transport in exciton–phonon systems: A Mori approach (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 261-270 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Employing Mori-formalism we calculate the polaron transport of an exciton–phonon system with linear site-occupational coupling. The main feature of our approach is a consistent treatment of the memory function, which is of 2nd order in an effective "smallness parameter" appearing after a Lang–Firsov transformation has been made. The memory function is divided into a quasicoherent part, which can be interpreted as a band type motion, decreasing with increasing temperature, an incoherent part describing usual hopping dynamics and two crossterms. In contrast to previous similar approaches our results do not display any divergence problem. It is found that the two cross terms yield a small transport contribution of coherent nature, at least within the accuracy of the present approximation. Due to this term, although higher order effects may result in a damping, the transport will display coherent features for a long time. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475377
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Turbulent mixing at high dilution ratio in a Sulzer-Koch static mixer (1986)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 25 (1986), S. 108-116 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i200032a017
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  • 5
    Electronic Resource
    Electronic Resource
    Explosive crystallization in silicon (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 3091-3099 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A survey of the possible autocatalytic crystallization processes called explosive crystallization in liquid and solid states is given. The explosive liquid-phase epitaxy with laterally moving coupled interfaces of melting and crystallization in amorphous silicon layers on insulators is investigated by the use of an experimental equipment consisting of three synchronized lasers supplying the temperature pulses for ignition, spreading, and stopping of the explosive front. The velocity of this explosive crystallization front measured by use of time-resolved reflectivity of a test beam is compared with the results of model calculations. The results are in good agreement. The crystal structure was investigated by optical and transmission electron micrography and represents crystalline laminae grown preferentially in the 〈110〉 direction over a distance of about 100 μm. Areas of some millimeters in diameter can be crystallized by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336910
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  • 6
    Electronic Resource
    Electronic Resource
    Multijunction upper subcell cascade photovoltaics for space applications (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 540-546 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new class of cascade high-efficiency photovoltaics designed for space-based applications is proposed. The design improves upper subcell performance and avoids electrical and optical losses associated with an intercell ohmic contact. Multijunction upper subcells reduce bulk recombination of photogenerated minority carriers by decreasing the average collection distance, yielding improved spectral response and radiation tolerance. A three-terminal design is employed which circumvents the need for a monolithic intercell contact and, thus, the losses associated with such a contact. Problems related to array interconnection of three-terminal devices may be solved by creating a two-terminal cell from complementary pairs (n-p-n and p-n-p) of three-terminal cells. Simulations of lattice-matched AlGaAs-GaAs and lattice-mismatched AlGaAs-InGaAs cascade cells show that one-sun AM0 efficiencies in excess of 26% and 28%, respectively, are possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341142
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  • 7
    Electronic Resource
    Electronic Resource
    Artifacts in the adiabatic approximation (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 3207-3213 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Generally, the adiabatic approximation is defined via a projection onto an adiabatically moving electronic base. The Hamiltonian then is separated into three constituents ("adiabatic,'' "diagonal-nonadiabatic,'' "nondiagonal-nonadiabatic''). A model system is considered for which the correct zero-order eigenfunctions are known. It is shown that with these any single of the three Hamiltonian constituents yields diverging expectation values; only their sum yields convergence. From this the conclusion seems stringent that any result pertaining to electronic transitions, which is based on the adiabatic approximation, is an artifact.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448219
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  • 8
    Electronic Resource
    Electronic Resource
    Resistance bi-stability in resonant tunneling diode pillar arrays (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1234-1236 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and characterized resonant tunneling diode pillar arrays. The array resistance switches between two stable states with a maximum room temperature current peak to valley ratio of 500:1. Both the high and the low resistance states are stable at zero bias suggesting that the device may be used for non-volatile memory storage. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113247
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  • 9
    Electronic Resource
    Electronic Resource
    Squeezed states in the trimer problem (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 6713-6723 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the present work we study unconventional ("squeezed'') exciton–phonon states in the trimer model. These quasifree states, which do not undergo self-trapping, are characterized by a nearly vanishing lattice distortion and a stiffening in the phonon part as well as a large amount of kinetic energy in the excitonic subsystem. In contrast, the "conventional'' exciton–phonon states are characterized by a strong lattice distortion and physically amount to a self-trapping of the exciton. In the trimer model a third type of exciton–phonon states have been found, which are a kind of "dimerized'' states, where self-trapping has taken place only partially. The different types of states are analyzed and discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471851
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  • 10
    Electronic Resource
    Electronic Resource
    Model Catalytic Oxidation Reactions: Oxygen with H2, NH3, and N2H4 on Rh(111) (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 805-815 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100002a051
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