Abstract
We study the effects of nonzero photon momentum on the triply differential cross section (TDCS) for ($\ensuremath{\gamma},2e$) processes. Due to the low value of the photon momentum, these effects are weak and manifest only in special kinematical conditions such as the back-to-back emission of the electrons with equal energy sharing. Helium and a few light heliumlike ions are treated in detail. Quite unexpectedly, the magnitude of these effects is maximal for relatively small photon energies. However, although this effect on the TDCS remains rather small, of the order of a few mb eV${}^{\ensuremath{-}1}$ sr${}^{\ensuremath{-}2}$, it is sufficient to be observed experimentally.
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