Evaluation of the single ionisation transition amplitude using
the CDW-EIS model within the framework of the impact-parameter method |
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Authors: | A Igarashi L Gulyás P D Fainstein |
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Institution: | (1) Department of Applied Physics, Faculty of Engineering, University of Miyazaki, Miyazaki 889-2192, Japan;(2) Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), PO Box 51, 4001 Debrecen, Hungary;(3) Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Avda E. Bustillo 9500, 8400 Bariloche, Argentina |
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Abstract: | The continuum distorted-wave model with an eikonal initial state for
ionisation is discussed within the framework of the impact-parameter
method. Particular attention is paid to the surface term, which
describes the transition by a distorting potential, and which has been
omitted in all of the previous calculations performed using the model.
However, this term is included in the transition amplitude in a recent
application of the model based upon a quantum-mechanical treatment. The
present study, in which the surface term is evaluated within the
impact-parameter method, shows that this term does not contribute to the
transition amplitude. In describing the electron-ejection mechanism for
a p±–H collision, the cross-sections evaluated using the
impact-parameter model show numerical agreement with those determined in
the quantum-mechanical version. This agreement indicates that the
contribution of the surface term calculated in the wave treatment
is negligible over the region in which the impact-parameter model is
valid. |
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Keywords: | 34 50 Fa Electronic excitation and ionization of atoms (including beam-foil excitation and ionization) |
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