Abstract
An expression of the density of the generalized oscillator strength (GOS) for electron impact ionization of atomic hydrogen using a classical trajectory to describe the state of the ejected electron is presented with the help of its linear-response representation in the framework of the first Born approximation (FBA). Based on the reproduction of the GOS density of the FBA, the target polarization and the postcollision interaction (PCI) effect are included within the expression. The target polarization expressed by the decreasing of the initial expectation momentum of the atomic electron decreases the GOS density for small energy transfer E and moves the Bethe ridge toward higher momentum transfer K for larger $E.$ The PCI effect should not be remarkable for the GOS density.
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