Abstract
Ionization of a many-electron atom by photoabsorption at high incident photon energies ω (but still ω⪡ mc 2) is characterized using examples of a two-electron atom in ground and in excited states. We use an approach (Phys. Rev. A 67 (2003) 022,709) based on asymptotic Fourier transform (AFT) theory in which the behavior of the high-energy photoabsorption matrix elements is understood in terms of behavior of the wave functions and electron–photon interaction in the vicinity of singularities of the many-body Coulomb potential. Within the unified AFT approach, we discuss correlation effects which characterize high-energy behavior of single ionization cross sections from the ground and from excited states and direct double ionization cross sections from the ground state.
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