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  • 1
    Electronic Resource
    Electronic Resource
    On the semiclassical impulse approximation for electron capture in asymmetric ion-atom collisions (1980)
    Springer
    The European physical journal 297 (1980), S. 203-214 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A derivation of the impulse approximation for the capture of a targetK-shell electron by a light projectile in ion-atom collisions is given in the framework of the semiclassical approximation. The impact-parameter dependence of the capture probability is calculated numerically without further approximations, and shows good agreement with recent experimental results for protons colliding with Ne and Ar. The validity of several peaking approximations and the relation to ionisation theories is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01892800
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  • 2
    Electronic Resource
    Electronic Resource
    The nonadiabatic sliding model and its application to δ-electron emission (1985)
    Springer
    The European physical journal 320 (1985), S. 557-564 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ejection of target K electrons by projectiles which move with an arbitrary velocityν is calculated with the help of optimised basis states. These states are variationally determined by minimising the time-dependent monopole perturbation. Asν increases, this prescription provides a continuous transition from molecular states to atomic states. It is demonstrated that a molecular description should not only be applied at lowν, but also for very large energies of the ejected electron even ifν is large. Calculations are performed for the collision systems Li+Ne and O+Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411853
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  • 3
    Electronic Resource
    Electronic Resource
    On the anisotropy ofδ-electrons from slow heavy-ion collisions in the emission angles ϑf andϕ f (1984)
    Springer
    The European physical journal 315 (1984), S. 21-27 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the united-atom perturbation theory, we have calculated the probability for the ejection of electrons from theK andL shells of heavy target atoms as a function of both polar and azimuthal angle of the electron. By including multipole transitions up tol=2, we found that for asymmetric collision systems and high electron energies the angular distribution has a dipole shape. Fors 1/2 electrons, the dependence on the azimuthal angle varies strongly with impact parameterb, with a preference of electron ejection in the same direction as the scattered projectile for smallb, and in the opposite direction for largeb. This is in agreement with first experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436204
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  • 4
    Electronic Resource
    Electronic Resource
    Radiative electron capture accompanying resonant nuclear scattering (1985)
    Springer
    The European physical journal 322 (1985), S. 191-197 
    Details
    ISSN: 1434-601X
    Keywords: 34.70.+e ; 25.70.Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A quantum mechanical theory for the radiative capture (REC) of a target electron by a heavy, swift projectile is formulated, allowing for resonant nuclear scattering through the use of distorted waves. Calculations are performed for the systems O16, Ne20→He within the exact strong potential Born theory and the impulse approximation. Similar structures as in the case of Coulomb capture are found in the transition probability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411881
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  • 5
    Electronic Resource
    Electronic Resource
    Charge transfer in heavy-ion collisions at relativistic velocities (1980)
    Springer
    The European physical journal 298 (1980), S. 13-19 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The capture of a target electron into a bound projectile state induced by the electromagnetic field of the fast moving projectile is calculated within the impulse approximation using the impact parameter description. The cross section is shown to decrease with (lnE)2/E at infinitely high projectile energiesE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01416023
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  • 6
    Electronic Resource
    Electronic Resource
    On the effect of off-shell wavefunctions onK andL shell charge transfer in fast, asymmetric collisions (1984)
    Springer
    The European physical journal 316 (1984), S. 161-167 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the semiclassical strong potential Born approximation (SPB) we have calculated the electron capture from theK andL shell of a heavy target atom by protons using two different peaking approximations. Both total capture cross sections and impact parameter distributions are compared with the impulse approximation (IA) and in the case of transfer from the ArK-shell also with an exact evaluation of the SPB and with experimental data. While for theK shell, all theories give a similar impact-parameter dependence, there is a substantial difference between IA and SPB results for the 2s subshell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412258
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  • 7
    Electronic Resource
    Electronic Resource
    A quasielastic scattering approximation for target ionisation by heavy structured projectiles (1995)
    Springer
    The European physical journal 34 (1995), S. 9-20 
    Details
    ISSN: 1434-6079
    Keywords: 34.50. Fa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A modification of the impulse approximation for capture to continuum is used to describe the ejection of loosely bound target electrons by heavy ions. In contrast to the currently applied elastic scattering models based on the binary encounter approximation, the present model treats only the short-range part of the ionic field within the elastic scattering theory, but uses the more sophisticated impulse approximation for the Coulomb tail of the interaction potential. Calculations have been performed for B q+, Fe q+, Au q+ and U q+ colliding with helium at energies between 0.5 and 6 MeV/amu. The comparison with absolute experimental spectra shows that theory works well for light projectiles, being able to describe the intensity and its variations with ionic chargeq ion in the binary encounter peak region. For very heavy low-energy projectile ions the intensity is, however, seriously under-predicted at small emission angles, indicating a breakdown of perturbative treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01443732
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  • 8
    Electronic Resource
    Electronic Resource
    Relativistic theory forK-shell ionisation by fast electrons (1989)
    Springer
    The European physical journal 11 (1989), S. 305-313 
    Details
    ISSN: 1434-6079
    Keywords: 34.80.Dp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The first-order Born approximation is applied for the calculation of the triply differential cross section for electron ejection from heavy target atoms. For the impinging electron, Coulomb waves as well as plane waves are used, and the exchange interaction is correctly accounted for. Two examples are considered,e −+Ag ande −+Ta. While for Ag, reasonable agreement with the experimental spectra is obtained with plane waves, the much heavier Ta target requires the use of Coulomb waves for the continuum electronic states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438504
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  • 9
    Electronic Resource
    Electronic Resource
    Electron transfer in nuclear reactions (1991)
    Springer
    The European physical journal 21 (1991), S. S291 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of nuclear reactions on atomic charge transfer in energetic ion-atom collisions is studied within a two-channel model for the reactions and the impulse approximation for electron capture. Large interference structures in the capture probability are found for the test reactions12C(d,p)13C,18O(p,α)15N,19F(p,α)16O and32S(p,p′)32S.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426328
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  • 10
    Electronic Resource
    Electronic Resource
    Second-order theories for electron loss in fast collisions with He atoms (1992)
    Springer
    The European physical journal 22 (1992), S. 701-711 
    Details
    ISSN: 1434-6079
    Keywords: 34.50.Fa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The momentum distribution of projectile electrons ejected in collisions with light targets is calculated within the second-order Born approximation for direct ionisation and within the electron impact approximation and the impulse approximation for electron capture to the target continuum. From comparison with available experimental data it is found that for forward emission angles the electron is well described by a projectile eigenstate, while at backward angles a target final state is more appropriate. At all angles the inclusion of simultaneous target excitation is very important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437252
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