Abstract
The time-dependent close-coupling method is used to calculate fully differential cross sections for the two-photon double ionization of the He($1{s}^{2}\phantom{\rule{0.16em}{0ex}}{}^{1}{S}^{e}$) ground state at a photon energy of 44 eV and the He($1s2s{\phantom{\rule{0.16em}{0ex}}}^{1,3}{S}^{e}$) excited states at a photon energy of 34 eV. The total and triple-differential cross sections for the ground state are in good agreement with available calculations. We also used the time-dependent close-coupling method to calculate fully differential nuclear-recoil cross sections of He${}^{2+}$ for the two-photon double ionization of He in the ground and excited states at the same photon energies. The nuclear-recoil differential cross sections of He${}^{2+}$ for the ground state are in good agreement with the measurements recorded with a reaction microscope at the free-electron laser facility in Hamburg (FLASH).
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