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  • Articles: DFG German National Licenses  (181)
  • 1995-1999  (68)
  • 1990-1994  (113)
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  • Articles: DFG German National Licenses  (181)
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Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of polarizabilities, potentials, and geometries of alkali–halide dimers (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 4397-4406 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An analysis of electronic polarizabilities, interionic potentials, and equilibrium geometries for 20 alkali–halide dimers such as Na2Cl2 is presented. The electronic polarizabilities of ions in dimers have been calculated by taking account of the electrostatic potential due to neighboring ions within the Seitz–Ruffa energy level analysis. The polarizabilities thus obtained for dimers are then used to evaluate the magnitudes of polarization energies and van der Waals dipole–dipole energies. For describing the overlap repulsive potential we have adopted two forms: (i) the revised version of the Born–Mayer potential and (ii) the Harrison form for the overlap repulsive energy. These potentials have been used to obtain the binding energies of monomers as well as dimers, spectroscopic constants of monomers, equilibrium geometries of dimers, and dimerization energies. The results have been discussed and compared with available experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461763
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of .beta.-lactams via cycloaddition of hydrazones with phenoxyketene (1990)
    s.l. : American Chemical Society
    The @journal of organic chemistry 55 (1990), S. 2196-2200 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00294a040
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stability of oblique modulation of ion-acoustic waves in a multicomponent plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 70-75 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of oblique modulation of ion-acoustic waves in a collisionless plasma consisting of two cold-ion species with different masses, concentrations, and charge states, and hot isothermal electrons is studied. Using the Krylov–Bogoliubov–Mitropolosky (KBM) perturbation technique, a nonlinear Schrödinger equation governing the slow modulation of the wave amplitude, is derived for the system. It is found that the presence of second-ion species significantly changes the instability domain in the k-φ plane. The effect of charge state, concentration, and mass of second-ion species on the modulational instability is discussed in detail. The predictions of the theory are found to be in good agreement with the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870561
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ion-acoustic compressive and rarefactive solitons in an electron-beam plasma system (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 559-566 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the general formulation of reductive perturbation method, the Korteweg–de Vries (KdV) equation is derived for an electron-beam plasma with hot isothermal beam and plasma electrons and warm ions. The soliton solution of the KdV equation is discussed in detail. It is found that above a critical velocity of electron-beam two additional ion-acoustic soliton branches appear. It is found that corresponding to two linear modes, the system supports the existence of compressive as well as rarefactive solitons depending upon the plasma parameters, while corresponding to other two wave modes, the system supports only rarefactive solitons. The effect of different parameters on the characteristics of solitons have been investigated in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870801
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of electron beam on the electron hole in a plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3557-3561 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An electron hole is discussed theoretically in an electron beam–plasma system. The nonlinear dispersion relation for the electron hole along with the conditions on the existence of the electron hole is investigated numerically. It is found that depending upon the beam parameters and radial boundary there are two regions where the electron hole can be formed. It is also seen that the upper limit on Mach number of the electron hole does not vanish even in the presence of the electron beam. The electron holes of high Mach number are possible only in the presence of an electron beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870890
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Dispersion properties of low-frequency waves in magnetized dusty plasmas with dust size distribution (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4380-4385 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dispersion properties of some low-frequency modes in magnetized dusty plasmas have been investigated theoretically, taking into account the dust size distribution. In contrast to earlier work on dispersion properties of different modes in magnetized dusty plasmas with a single dust size, it is assumed that the dust grains are distributed in size. Assuming that the dust size is given by a power law distribution, with a nonzero minimum and finite maximum grain size, the effect of dust size distribution on the dispersion properties of some electrostatic and electromagnetic modes in magnetized dusty plasmas is investigated. It is seen that in the very low-frequency (VLF) regime, taking into account the size distribution leads to a new kind of damping for an electrostatic dust-cyclotron and right-handed circularly polarized (RCP) electromagnetic Alfvén mode, whereas the left-handed circularly polarized (LCP) Alfvén mode remains undamped. In the low-frequency (LF) regime, size distribution results only in the modification of the dispersion relations for all the modes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872055
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    High precision, high-heat-load mirror for the APS diagnostics beamline : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3356-3356 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high precision mirror for measuring the storage ring beam size is under fabrication for the APS diagnostics beamline. The mirror, which will be located at 12.9 meters from the bending magnet source, is required to maintain less than 1.6 microradian slope error. The mirror design consists of a slot in the center in order to reduce incident power from the 300-mA, 7-GeV beam during normal operation. Water channels with fins are machined in the GlidCop mirror body to protect it against extremely high heat loads under accidental beam deviations. The mechanical design of the mirror, and results from a thermal analysis are presented in this paper. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147375
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Multichannel Raman spectrometry system for weakly scattering materials at simultaneous high pressures and high temperatures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2821-2827 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Raman system is described which is suitable for rapid determination of Raman spectra of silicates and other weak Raman scatterers under simultaneous high-pressure and high- temperature conditions. Samples are pressurized with an argon pressure medium and Sm:YAG pressure standard in an Inconel 718 or rhenium Merrill–Bassett diamond–anvil cell that is externally heated in a vacuum oven equipped with quartz windows on either side. Raman spectra are excited and collected through the front window using ≈160° scattering geometry. A triple spectrometer in conjunction with a holographic notch filter, disperses the Raman scattered radiation onto a liquid-nitrogen-cooled CCD detector. Simultaneously measured Sm:YAG fluorescence spectra are collected through the rear window and routed via an optical fiber to a second multichannel spectrometer system equipped with a diode-array detector. The high sensitivity of the detectors and the simultaneous measurement technique enable detection of and compensation of pressure drifts occurring at high temperature. The performance of the system is demonstrated by measurement of the positions and linewidths of the high-frequency Raman modes of polycrystalline forsterite (α-Mg2SiO4) at temperatures up to 930 K at pressures of ∼8 GPa and up to 842 K at pressures in the range 12–14 GPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144368
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Short-range order, microstructure and their correlation with light-induced degradation in hydrogenated amorphous silicon deposited at high growth rates by cathode heating technique (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5208-5213 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogenated amorphous silicon (a-Si:H) films were deposited at high growth rates by increasing the rf power density in a (SiH4+H2) discharge, while powder formation due to gas phase polymerization was controlled by heating the cathode together with the anode. A combination of Raman scattering, infrared absorption, and small angle x-ray scattering experiments was used to study the short-range order and microstructure of films deposited in different (dusty or otherwise) plasma conditions. The results were correlated with initial and light-soaked photoresponse to demonstrate that films with more microstructure and less short-range order were generally poorer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357239
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    A complete characterization of trapping levels in red mercuric iodide single crystals (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7884-7893 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photon stimulated current measurements have been performed on red mercuric iodide single crystals in order to determine the trap energy, trap density, and capture cross section for different trapping levels that may be present in the platelet-shaped single crystals of red mercuric iodide grown by polymer controlled growth technique in vapor phase. The procedure of analysis of these measurements is outlined in brief. The analysis has shown that these crystals in general possess four trapping levels: two electron trapping levels with energies 0.10 and 0.31 eV and two hole trapping levels with energies 0.15 and 0.59 eV. The analysis has further shown that the total trap density is only of the order of 1013/cm3, indicating the superiority of this growth technique over other techniques. The analysis has also shown that all four trapping levels are of retrapping type. Finally, the possible mechanisms of formation of these trapping levels and the ways in which these trapping levels will influence the detector operation at room temperature are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356574
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    Paper (German National Licenses)
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