Quantal and classical correspondence of double scattering

Electron emission from atom-atom collisions is analysed within the framework of both quantal and classical dynamics. The authors examine the effect of explicit electron-electron (e-e) interactions on the ejected electron spectra in hard collisions involving simultaneous excitation and ionization in the collision of two structured atoms. A double scattering sequence represented by a second-order Born approximation has been show to give a dominant contribution over the single scattering to projectile ionization. A classical simulation confirms the double scattering process is analogous to the Thomas two-step capture mechanism. The authors find good agreement between quantal and classical calculations, showing the convergence of the Born series to second order and the possibility of a classical treatment for e-e interactions in non-perturbative regimes. They also find that the shape of the ejected electron spectrum is very different from the usually assumed Lorentzian distribution.

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