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The narrowing of electron and ion wave packets in the process ofphotoionization is investigated, with the electron-ion recoil fully taken intoaccount. Packet localization of this type is directly related to entanglementin the joint quantum state of electron and ion, and to Einstein-Podolsky-Rosenlocalization. Experimental observation of such packet-narrowing effects issuggested via coincidence registration by two detectors, with a fixed positionof one and varying position of the other. A similar effect, typically with anenhanced degree of entanglement, is shown to occur in the case ofphotodissociation of molecules

Packet narrowing and quantum entanglement in photoionization and photodissociation