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  • 1
    Electronic Resource
    Electronic Resource
    Possible mechanism for the photofragmentation of buckminsterfullerene (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 10603-10605 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100205a008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A molecular dynamics study of doubly charged Ar2+n clusters (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 8277-8283 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular dynamics modeling of doubly charged Ar2+n cluster destruction is performed, where analytical expressions are constructed for the interatomic potentials. It is shown that for the small cluster Ar2+13, Coulomb explosion leads mostly to the detachment of ionic dimers. In larger clusters (n≥55), Coulomb explosion leads to the fission of the doubly charged cluster to two singly charged clusters of similar size. After the fission, the singly charged clusters evaporate some number of neutral atoms. The critical size of the Ar2+n clusters' stability is found to be nc=92–95, i.e., 92–95 atoms is the maximal size of a cluster undergoing Coulomb explosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466772
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electron energy levels in a quantum well within an in-plane magnetic field (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2442-2445 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The exact eigenenergy spectrum of an electron is calculated in a quantum well within an in-plane magnetic field. The numerical solutions for the excited energy states as well as the ground-state energy are found for various quantum-well widths and barrier heights. The cyclotron orbits are considerably affected by the quantum well. The energy levels higher than the potential height of the quantum well and the energy levels lower than the potential height of the quantum well show quite different behaviors. These are explained with the properties of the combined potential and the wave function inherent to the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344254
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of patterned laser-induced chemical vapor deposition (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2353-2357 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An expression for the grating growth rate in laser-induced chemical vapor deposition is derived which incorporates the contribution from the plasmon field intensity. It is found that the ultimate grating height is independent of laser intensity, while the grating growth rate is linear in intensity. For the shallow grating case the expression reduces to exponential growth. Also discussed are several possible mechanisms which account for the periodic structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337949
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Escape time from a biased asymmetric double quantum well (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2711-2713 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The escape time from the quasibound states of an asymmetrical structure consisting of a narrow well and a wide well separated by a relatively thick barrier under bias has been calculated. As expected, a monotonic decrease in the escape time from the ground state of the wide well as a function of applied voltage has been found. However, the variation of the escape times from the ground state of the narrow well and the first-excited state of the wide well versus applied voltage form a minimum at a common point. This is the signature of resonant tunneling when these two states almost coincide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348621
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    Paper (German National Licenses)
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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Dwell time in doped double-barrier heterostructures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1855-1861 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A time-dependent Schrödinger equation has been solved numerically for a double-barrier and a quantum-well resonant tunnelling structure. Special emphasis has been paid to the system where barriers are doped specially by negative delta-function potentials (δ potentials) which broaden the widths of the resonances and in turn decrease the dwell times. The strengths of the delta functions could be such that they may form bound states in the barrier regions, but the states bound to δ potentials are very shallow. Delta-function potentials are replaced by equivalent barriers of different heights and widths which are easy to incorporate into the numerical calculation of the propagation of the wave packet, and the corresponding physical structures can be conveniently fabricated. It is found that for a certain strength of the δ potential or parametric value of the equivalent barriers in the barriers of the resonant tunneling structure, there are three resonance states very close together. The square of the wave functions trapped in the well region for the states oscillates in time for a broad wave packet in k space, whereas the wave function trapped in the whole structure decays exponentially. The oscillating part has a resemblance with the quantum beats. There are no oscillations for a narrow wave packet in k space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354793
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  • 9
    Electronic Resource
    Electronic Resource
    Internal explosion in laser ablation of superconducting targets (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4227-4231 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature profile inside a superconducting target in laser ablation is calculated for laser pulses of various shapes. The calculation is based on the equation of heat conduction. All parameters characterizing the target material are assumed to be temperature dependent and are determined empirically by extrapolating experimental data to the melting point. The receding velocity of the vapor-solid interface is determined by the dynamical balance of energy. Our calculation shows that, in general, there exist subsurface overheating spots at different instants as long as the laser pulse intensity is strong enough. The dependence of their occurrence on the pulse shape is analyzed, and conditions to avoid them without jeopardizing the deposition process are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352234
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  • 10
    Electronic Resource
    Electronic Resource
    Thermoelectric phenomena in metals under large temperature gradients (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3375-3377 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonlinear contributions to thermoelectricity are studied when large temperature gradients are present in metals. A theory is presented to account for these phenomena in the case of monovalent metals obeying a parabolic dispersion law. Simple experiments are proposed in which nonlinear terms are relevant and produce measurable effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348984
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