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  • 1
    Electronic Resource
    Electronic Resource
    Calculation of atomic scattering factors for the helium atom by means of the six-term Hylleraas wave function (1963)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 16 (1963), S. 926-928 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X63002462
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Atomic scattering of helium-like systems from analytic Hartree–Fock wave functions (1964)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 17 (1964), S. 61-62 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X64000147
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Two coupled parabolic wells under an electric field (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4006-4014 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The tunability of the states of two coupled parabolic quantum wells subjected to an electric field is studied by using the transfer-matrix approach. Two numerical procedures are used. Both involve subdividing the potential profile into a number of linear or step partitions. For the linear partition approach, the Airy function solution of the Schrödinger equation is employed while for the step approach, the plane-wave solution is used. Both methods give identical results if small enough partition intervals are used. It is found that the plane-wave method is easier and that it simplifies the programming without seriously sacrificing the calculational speed. The coupled well width, the barrier width, and the applied field were changed systematically to study the changes in the energy levels, wave functions, and transmission of a resonant tunneling diode based on the double parabolic structure. The anticrossing between the energy levels on changing the well width or the bias of the coupled wells is seen and discussed. It is also found that the transmission peak is sharp and deep if the resonance occurs in both of the coupled wells at the same energy, while it is smaller and broader if the resonance occurs in only one well because the wave function is blocked by the other nonresonant well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354444
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Change in density of states in a resonant tunneling structure due to a scattering center in the well (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5724-5728 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The change in density of states and transmission resonance energy shifts have been calculated for a double-barrier single-quantum-well heterostructure by placing a scattering center in the middle of the well and representing it by (1) a thin barrier of variable height and fixed width or (2) a delta-function potential of variable strength. It is found that the energies of the even-resonance states shift towards the higher energies and states get broader as the height of the thin barrier increases. Similar behavior is observed for the delta-function potential as the strength of the delta-function potential increases. The peak value of the density of states versus energy plot are reduced for even resonance states due to the broadening of these states. The physical processes related with these behavior are discussed. Moreover, there are no changes in the odd-resonance states because of the nature of their wave functions in the well region of the resonant tunneling structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346966
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A comparative study of electron transport phenomenon in the keV range (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 6059-6064 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On incorporating two different electron inelastic scattering cross sections by Möller [Z. Phys. 70, 786 (1931)] and Gryzinski [Phys. Rev. 138, 336 (1965)], Monte Carlo calculations have been performed to calculate the energy, angular distribution, and coefficients of transmitted and backscattered electrons in Al films of different thicknesses for 15- and 20-keV incident electron energies. The calculations from both the models are found to yield similar results and both of them give good agreement with the available experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343585
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Electric-field dependence of observables in finite parabolic quantum wells (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2328-2334 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electric-field dependence of eigenvalues, eigenfunctions, electron-hole overlap integrals, and dipole moments in several finite parabolic quantum wells are calculated with the shooting method and compared with corresponding results for a square well. The results are more strongly field dependent for parabolic wells with a fixed-volume integral than those for the square well. Reasons for this behavior are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348715
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  • 7
    Electronic Resource
    Electronic Resource
    Spatially dependent effective mass and optical properties in finite parabolic quantum wells (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 796-799 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of the spatial dependence of the effective mass in GaAs/AlxGa1−xAs parabolic quantum wells on several of their optical properties have been calculated. The largest effects are on the conduction-band levels which are lowered with respect to those with constant effective mass. Effects on oscillator strengths, hole energy levels, and electron/hole overlaps are small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351401
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Monte Carlo study of backscattering of β rays from various monoatomic slabs (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 5-9 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Monte Carlo study of the backscattering coefficients and backscattering intensity of β rays from 204 Tl and 90 Y sources from slabs of Al, Cu, Sn, Tb, and Pb of different thicknesses is carried out. The results for angles of incidence 0°, 30°, 45°, and 60° and absorber thicknesses of 3, 5, 10, 15, 30, and 50 mg/cm2 for 204 Tl β rays and thicknesses of 3, 5, 10, 20, 50, 100, 150, and 190 mg/cm2 for 90 Y β rays are given in tabular form. On using normalization factors good agreement with the measurements of Sharma and Singh is obtained. A phenomenological attempt to investigate a relationship between the backscatter intensity and atomic number Z of the backscatterer indicates that the backscattered intensity is a linear function of ln Z(Z+1). A partial theoretical justification for this relationship is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343857
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Intersubband transitions in an asymmetric quantum well with a thin barrier or a delta-function potential (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1933-1936 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The changes in the bound-state energies and oscillator strength for intersubband transitions brought about by a thin barrier in the middle of an asymmetric quantum well are calculated, with a particularly close look at such changes as the middle barrier height approaches the bound-state energies. It is found that the oscillator strength goes through a slight change as the barrier height approaches the ground-state energy but an abrupt change when it approaches the excited bound-state energy. A suitable explanation for this change is provided. A similar tailoring of the intersubband transitions is also achieved by placing a delta-function potential in the vicinity of the middle of the well but without any abrupt change in the oscillator strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346590
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    Paper (German National Licenses)
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