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  • American Institute of Physics (AIP)  (6)
  • American Society of Hematology  (2)
  • 1985-1989  (8)
  • 1
    Electronic Resource
    Electronic Resource
    On the microscopic derivation of the finite-temperature Josephson relation in operator form (1986)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 27 (1986), S. 1082-1092 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: As a microscopic description of the Josephson junction, two BCS models, are studied in the strict pair formulation with quite an arbitrary weak coupling potential. The modular formalism, the separate gauge transformations, and the limiting dynamics are analyzed for the interacting system in terms of the GNS representation of the uncoupled limiting Gibbs state. By means of the Connes theory the condensed Cooper pair and the quasiparticle spectrum is shown to be stable against weak perturbations. The modular formalism is used to construct a local approximation to the renormalized particle number operator and, by this, its time dependence, in spite of this observable not being affiliated with the von Neumann algebra of the temperature representation. The time derivation from this unbounded operator-valued function coincides with the limit of the local currents and splits under a natural assumption into a sum of the Josephson and the quasiparticle current operator extending the two-fluid picture also to the coupled model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527152
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum-confined subband transitions of a GaAs sawtooth doping superlattice (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1133-1135 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this letter we present for the first time the observation of quantum-confined transitions of a short-period sawtooth doping superlattice in photocurrent and luminescence. The luminescence was investigated with different laser intensities. Due to the nature of the band modulation of sawtooth doping superlattices, the resonant energies for optical transitions are dependent on the intensity of the laser beam. We present a model, which incorporates both the Kronig–Penney energy dispersion and the self-consistent intensity-dependent internal field to explain the observed energy shift. Furthermore, the differences between photocurrent and luminescence measurements are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100739
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  • 3
    Electronic Resource
    Electronic Resource
    Photocurrent spectroscopy in a sawtooth doping superlattice (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1967-1969 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report an investigation of photocurrent response in a sawtooth doping superlattice which is composed of alternating n(Si) and p(Be) δ-doping layers with undoped GaAs layers (7–15 nm) between them. A selective contact method is used to measure the interesting behavior of the subband gap compared with the gap of the host semiconductor. The photocurrent is finite even when the photon energy is below the gap of GaAs and can be varied by applying a bias voltage between the n and p contacts. The observed phenomena can be explained by a generalized Franz–Keldysh model which takes into account the finite voltage drop inside the sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99592
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  • 4
    Electronic Resource
    Electronic Resource
    Spatial localization of impurities in δ-doped GaAs (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1508-1510 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Capacitance-voltage profiles on δ-doped GaAs grown by molecular beam epitaxy reveal extremely narrow widths of (approximately-less-than)40 A(ring) at room temperature. Subband structure and capacitance-voltage (C-V) profiles of δ-doped GaAs are calculated self-consistently. Experimental C-V profiles agree with self-consistent results, only if we assume that Si impurities are localized on the length scale of the lattice constant in the host GaAs zinc-blende lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99114
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  • 5
    Electronic Resource
    Electronic Resource
    On the structure and stability of the H2O− ion (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2913-2918 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Potential energy surfaces of the three lowest bound electronic states (1 2A′, 2 2A′, and 2A″) of H2O− have been investigated by ab initio calculations using highly correlated electronic wave functions. Minima resulting from ion–quadrupole interactions between the O−(2P) and H2(1Σ+) fragments were found for linear 2Σ+ and 2Π O−⋅⋅⋅H2 structures. The corresponding dissociation energies amount to about 0.2 eV. The 2Σ+ (2A′) minimum is separated by a barrier from the H2O+e continuum, while the 2Π (2A″) state is connected via a similar barrier to another local minimum of 2Π symmetry originating from the ion–dipole interaction of OH(X 2Π) and H−(1S). Hence, in accordance with recent experimental findings of de Koning and Nibbering, the H2O− ion is found to be a bound species in ion–quadrupole or ion–dipole cluster structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453079
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  • 6
    Electronic Resource
    Electronic Resource
    MCSCF-CI calculations of infrared transition probabilities in the CH− and NH− ions (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 5037-5044 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Potential energy, electric dipole, and electronic transition moment functions have been calculated for several bound electronic states of CH− and NH− from accurate electronic wave functions. Spectroscopic constants for the X 2Π state of NH− have been compared with the data recently obtained by laser induced autodetachment spectroscopy. Spectroscopic constants of the A 2Σ+ state of NH− and radiative X 2Π–A 2Σ+ transition probabilities are presented. Spectroscopic constants and infrared transition probabilities for the X 3Σ− and the a 1Δ states of CH− have been calculated. The radiative lifetime of v=1 in CH−(X 3Σ−) is found to be in a very good agreement with a recent experimental value. The transition probabilities are for both ions much larger than those of their neutral counterparts, and increase in the series OH−, NH−, CH−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450653
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  • 7
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    Localization of thrombospondin in clots formed in situ (1985)
    American Society of Hematology
    Details
    Publication Date: 1985-11-01
    Description: Thrombospondin is a principal glycoprotein secreted by thrombin- stimulated platelets and has known affinities for fibrinogen and fibrin. We studied the distribution of thrombospondin in clots formed in situ on Formvar-coated coverslips at 37 degrees C for intervals up to 17 hours. The distributions of three other major platelet granular proteins--fibrinogen, fibronectin, and von Willebrand factor (vWF)-- were also determined. The portions of the clots adhering to the coverslips after stripping, washing, and fixation with formaldehyde were stained for the four proteins by the peroxidase-antiperoxidase technique. Monoclonal antibodies were used to localize thrombospondin, fibronectin, and vWF; affinity-purified polyclonal antibodies were used to localize fibrinogen. Platelets stained positively for all four proteins. Thrombospondin was maximally present in the fibrin meshwork from 1 1/2 to 2 hours, after which the intensity of staining decreased until only trace amounts of thrombospondin were detectable between four and 17 hours. Antifibrinogen and, to a lesser extent, antifibronectin stained the fibrin meshwork at all time points. The vWF was not detectable in the fibrin meshwork at any time point. Staining of polymorphonuclear leukocytes (PMNLs) in a fine granular pattern was found with antithrombospondin. The fraction of PMNLs staining positively was 6% to 14% at 1/2 to 4 hours and increased at eight hours to 27%. At 17 hours, 52% of the PMNLs stained for thrombospondin. More than 48% of the PMNLs stained with antifibrinogen at all time points. PMNLs did not stain for either fibronectin or vWF. These studies indicate that thrombospondin is a transient component of the temporary fibrin meshwork and has a unique spatial and temporal distribution in the hemostatic plug.
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
    Published by American Society of Hematology
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  • 8
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    Localization of thrombospondin in clots formed in situ (1985)
    American Society of Hematology
    Details
    Publication Date: 1985-11-01
    Description: Thrombospondin is a principal glycoprotein secreted by thrombin- stimulated platelets and has known affinities for fibrinogen and fibrin. We studied the distribution of thrombospondin in clots formed in situ on Formvar-coated coverslips at 37 degrees C for intervals up to 17 hours. The distributions of three other major platelet granular proteins--fibrinogen, fibronectin, and von Willebrand factor (vWF)-- were also determined. The portions of the clots adhering to the coverslips after stripping, washing, and fixation with formaldehyde were stained for the four proteins by the peroxidase-antiperoxidase technique. Monoclonal antibodies were used to localize thrombospondin, fibronectin, and vWF; affinity-purified polyclonal antibodies were used to localize fibrinogen. Platelets stained positively for all four proteins. Thrombospondin was maximally present in the fibrin meshwork from 1 1/2 to 2 hours, after which the intensity of staining decreased until only trace amounts of thrombospondin were detectable between four and 17 hours. Antifibrinogen and, to a lesser extent, antifibronectin stained the fibrin meshwork at all time points. The vWF was not detectable in the fibrin meshwork at any time point. Staining of polymorphonuclear leukocytes (PMNLs) in a fine granular pattern was found with antithrombospondin. The fraction of PMNLs staining positively was 6% to 14% at 1/2 to 4 hours and increased at eight hours to 27%. At 17 hours, 52% of the PMNLs stained for thrombospondin. More than 48% of the PMNLs stained with antifibrinogen at all time points. PMNLs did not stain for either fibronectin or vWF. These studies indicate that thrombospondin is a transient component of the temporary fibrin meshwork and has a unique spatial and temporal distribution in the hemostatic plug.
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
    Published by American Society of Hematology
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