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  • 1985-1989  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Photoluminescence killer center in AlGaAs grown by molecular-beam epitaxy (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2833-2836 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Origin of a nonradiative center in AlGaAs grown by molecular-beam epitaxy was investigated by secondary ion mass spectroscopy and deep-level transient spectroscopy, from the change of photoluminescence intensity with anneal treatment, and from its comparison with GaAs. Aluminum-oxygen complex is a most probable defect which acts as a nonradiative center in AlGaAs, and the oxygen would evaporate as Al2O from the surface, which would be a reason why the photoluminescence intensity increases under higher substrate temperature and lower V/III flux ratio. The electron-trap level at 0.76 eV from the conduction band would be the recombination center, and the photoluminescence intensity is inversely proportional to the trap concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336938
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relativistic structure of stochastic wave–particle interaction (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 1505-1514 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stochastic interactions of charged particles with electrostatic waves propagating at arbitrary angles to an external magnetic field are studied based on a relativistic canonical Hamiltonian formalism. The present theory, however, is valid also for electromagnetic waves after a slight modification. The stochasticity threshold is derived utilizing Chirikov's criterion. It is found that relativistic effects are important for electrons interacting with relatively high phase velocity waves even at nonrelativistic initial energies. In particular, the relativistic generalization of a previous theory [Phys. Rev. Lett. 34, 1613 (1975); Phys. Fluids 21, 2230 (1978)] moves the degeneracy of primary resonances in nearly perpendicular directions to the angles where the parallel phase speed approximately equals the speed of light. It was also demonstrated for the first time that initially low energy electrons can gain relativistic energies (γ(very-much-greater-than)1) by means of the stochastic interaction with an electrostatic wave, where γ is the relativistic factor. Moreover, properties of second-order islands that form within primary islands have been studied. Finally, the nature of the stochastic particle energization by electrostatic waves is compared with that by electromagnetic waves, and the results are applied to the problem of electron acceleration during ionospheric modification experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866690
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electromagnetic radiation from strong Langmuir turbulence (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2185-2189 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of computer simulations is reported showing the generation of electromagnetic radiation by strong Langmuir turbulence. The simulations were carried out with a fully electromagnetic 2 1/2 -dimensional fluid code. The radiation process takes place in two stages that reflect the evolution of the electrostatic turbulence. During the first stage while the electrostatic turbulence is evolving from an initial linear wave packet into a planar soliton, the radiation is primarily at ωe. During the second stage when transverse instabilities lead to the collapse and dissipation of the solitons, 2ωe and ωe radiation are comparable, and 3ωe is also present. The radiation power at ω=2ωe is in good agreement with theoretical predictions for electromagnetic emissions by collapsing solitons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866618
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electromagnetic effects on parametric instabilities of Langmuir waves (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 538-546 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electromagnetic effects on parametric instabilities of Langmuir waves in unmagnetized plasmas are investigated. A fully electromagnetic treatment of these instabilities removes discontinuities of frequencies that are found to be present in the wave vector space of the electrostatic dispersion equation. Furthermore, it was found that a pair of novel parametric instabilities of Langmuir pump waves emerge owing to the electromagnetic effects. Both of them excite electromagnetic plasma waves near the plasma frequency. One of them is the hybrid modulational instability, which is a four-wave up-conversion process. As the wave vector of the pump wave increases the hybrid parametric decay instability becomes dominant. This is a three-wave down-conversion instability, which has been investigated previously [Space Sci. Rev. 26, 3 (1980); Phys. Rev. A 27, 552 (1983); Astrophys. J. 308, 954 (1986)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866836
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    MBE apparatus for in situ grazing incidence x-ray diffraction : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2362-2364 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A molecular beam epitaxy (MBE) apparatus furnished with two E-gun evaporators, two Knudsen cells and RHEED, was built for in situ grazing incidence x-ray diffraction studies. By adopting horizontal sample setting geometry, the entire ultrahigh vacuum chamber was rotated simply with the aid of a spring, and a large sample area was irradiated by the x-rays. Using this apparatus, we observed the 7×7 superstructure on a Si(111) surface and at a SiO2/Si(111) interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140772
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of free-electron lasing stimulated by a counterpropagating plasma wave (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2495-2501 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A relativistic fluid theory is constructed to analyze the inverse Compton scattering of an unmagnetized counterpropagating plasma wave by a cold relativistic electron beam. A Langmuir wave and electromagnetic plasma wave wigglers are considered, and the properties of the two types of wigglers are comparatively discussed. The growth rates are comparable to those of the ac free-electron laser and the free-electron lasers with magnetostatic wigglers in the Raman regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859184
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Parametric instabilities of Langmuir waves in weak/moderate magnetic fields (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1998-2009 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A general dispersion equation, which describes the parametric instabilities of some electrostatic waves in a weak/moderate magnetic field, is derived. The dispersion equation is solved numerically to study the effects of a moderately intense magnetic field on the parametric instabilities of relatively large amplitude Langmuir waves. A Langmuir pump wave can couple with various low-frequency branches such as lower-hybrid, electron-acoustic, ion-cyclotron, and ion-acoustic branches. The transverse modulational instability is most sensitive to a magnetic field. Even for a Langmuir wave with W¯∼0.1, where W¯ is the ratio of the time-averaged wave energy to the electron thermal energy, some portions of the transverse modulational instability in the direction exactly perpendicular to the external magnetic field are quite easily suppressed. However, some oblique instabilities may be enhanced by a magnetic field. In general, a moderate magnetic field suppresses most of the oblique instabilities, and the parametric instabilities become essentially one dimensional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859063
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Particle-in-cell simulations of stochastic electron acceleration (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2530-2532 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of a series of particle-in-cell simulations of stochastic wave–particle interaction are presented. The threshold for stochasticity was confirmed. The simulations demonstrate that in a strong magnetic field plasma waves with quiver velocities much less than the speed of light but above a certain threshold can stochastically accelerate electrons to energies far greater than 1 MeV. Moreover, self-consistency effects drive return currents and produce energetic runaway electrons that violate an invariant of motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859189
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Coherent Si growth on GaAs substrates by vapor phase deposition (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 347-349 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial Si layers with low dislocation density were grown on GaAs substrates by pyrolysis using disilane. The dislocation density evaluated from SECCO etching (HF:H2 SO4 :K2 Cr2 O7 =100 cc:50 cc:2g) was less than 104/cm2, which is lower by two orders of magnitude than that of the GaAs layer on Si substrates. We found that the electron mobility of Si layers on GaAs substrates could be raised by decreasing the growth rate and a high mobility value the same as that of a homoepitaxial layer was obtained, although the Si layers were contaminated by an arsenic impurity of 1018 cm−3 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100965
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Plasma and right auricle concentrations of atrial natriuretic polypeptide in children with cardiac diseases (1988)
    Springer
    European journal of pediatrics 147 (1988), S. 485-489 
    Details
    ISSN: 1432-1076
    Keywords: Atrial natriuretic polypeptide ; Cardiac disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To investigate the atrial natriuretic polypeptide (ANP) levels in congenital heart diseases, we measured plasma immunoreactive ANP (ir-ANP) in 29 patients with left-to-righ shunt, and right auricle ir-ANP in 25 patients who underwent operation. The levels of ir-ANP in the pulmonary artery correlated with that in the femoral vein (r=0.95, P〈0.001), mean pulmonary arterial pressure (r=0.74, P〈0.001) and right atrial pressure (r=0.53, P〈0.01). The right auricle ir-ANP level was high in patients with heart failure combined with pressure or volume overload of the right atrium, as observed in tricuspid atresia, complete endocardial cushion defect, and total anomalous pulmonary venous drainage. These results suggest that the production of ANP in the atrium increases as a compensatory or secondary response to persistent release of ANP into the circulation in cardiac diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00441972
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