Light‐induced singly and doubly excited states of the negative hydrogen ion

We present a fully correlated ab‐initio calculation of electronic states of H− in a strong electromagnetic field, in the high‐frequency limit. We find a nonmonotonic increase of the detachment energy with increasing field intensity, to a value larger than that of the unperturbed H− ion. Several light‐induced bound states do appear, among which doubly excited states. Curves giving the binding energies of these states as a function of intensity are presented.