(γ,2e) total and differential cross-section calculations for helium at various excess energies

There have recently been several relative measurements of triple differential cross sections for the double photoionization of helium by a number of various experimental groups. In response to these measurements, we present theoretical calculations of total integral, single differential, and triple differential cross sections for this process using the time-dependent close-coupling method. This approach has previously given excellent agreement with absolute experimental measurements [see Colgan et al., J. Phys. B 34 L457 (2001)]. Detailed comparisons with the experimental measurements are made, where possible, and, in general, very good agreement is found with the relative experiments over a wide range of excess energies and ejected electron energies and angles