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

Publisher Website
Google Scholar
Abstract
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.