2D projection (left) of the momentum distribution of the outgoing photoelectrons from xenon atoms irradiated by EUV FEL pulses at a photon energy of 24.3 eV, and the corresponding slice (right) through the retrieved 3D photoelectron momentum distribution as obtained from an Abel inversion

Figure 1. 2D projection (left) of the momentum distribution of the outgoing photoelectrons from xenon atoms irradiated by EUV FEL pulses at a photon energy of 24.3 eV, and the corresponding slice (right) through the retrieved 3D photoelectron momentum distribution as obtained from an Abel inversion.

Abstract

Xenon atoms are double-ionized by sequential two-photon absorption by ultrashort extreme ultraviolet free-electron laser pulses with a photon energy of 23.0 and 24.3 eV, produced by the SPring-8 Compact SASE Source test accelerator. The angular distributions of photoelectrons generated by two-photon double ionization are obtained using velocity map imaging. The results are reproduced reasonably well by the present theoretical calculations within the multi-configurational Dirac–Fock approach.