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We study the fragmentation of very large dimers into two singly charged ionscaused by absorption of a photon. In this process a photo electron emitted fromone atom of the dimer has certain chances to hit the other atom knocking outone of its electrons. This results in the production of two singly charged ionsand the consequent Coulomb explosion of the residual doubly charged system. Wedevelop a theory of this process and apply it to calculate the fragmentation of$^4$He$_2$, $^7$Li - $^4$He and $^6$Li - $^4$He dimers. Our results for thehelium dimer are in good agreement with available experimental data. For theLi-He dimers (where experimental data are still absent) our results predictthat this fragmentation mechanism becomes much more efficient than in the caseof He$_2$. We also show that, provided the recoil effects are of minorimportance, the so called reflection approximation is very accurate also forlarge dimers.

Photo fragmentation of large dimers into singly charged ions via the knockout mechanism