Abstract
We present convergent-close-coupling (CCC) calculations of the angular anisotropy parameters ${\ensuremath{\beta}}_{2},{\ensuremath{\beta}}_{4}$ and the recoil ion momentum distribution $d\ensuremath{\sigma}∕d\mathbit{p}$ in two-photon double ionization (TPDI) of helium. In a stark contrast to single-photon double ionization (SPDI), where the ${\ensuremath{\beta}}_{2}$ parameter varies widely changing the angular distribution from isotropic to nearly dipole for slow and fast photoelectrons, respectively, the $\ensuremath{\beta}$ parameters for TPDI show very little change. The angular distribution of the recoil ion is fairly isotropic in TPDI as opposed to a strong alignment with the polarization of light in SPDI.
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