After an electron-positron pair is produced by a high-energy photon hitting the nucleus of an atom, is it possible for the produced positron to annihilate with a bound electron from the very same atom it was produced in? In this situation, what would happen to the produced electron--would it be captured by the atom to replace the lost electron? I've been wondering about this for a while, and I've only ever been able to reason that the first scenario would be possible under extremely rare circumstances. Really rare. But I'm not entirely sure that such a thing would be possible under ANY circumstances. I've asked around and done searches, but have only been able to find that it is possible for a positron to annihilate with a bound electron, and that the produced particles don't necessarily have to annihilate with each other, not necessarily that the two processes can be linked and occur subsequently. I'm wondering what you all might think on the matter?