  Due to electronic many-body effects, the ionization of a molecule can trigger
ultrafast electron dynamics appearing as a migration of the created hole charge
throughout the system. Here we propose a scheme for control of the charge
migration dynamics with a single ultrashort laser pulse. We demonstrate by
fully ab initio calculations on a molecule containing a chromophore and an
amine moieties that simple pulses can be used for stopping the charge-migration
oscillations and localizing the charge on the desired site of the system. We
argue that this control may be used to predetermine the follow-up nuclear
rearrangement and thus the molecular reactivity.
