Abstract
We present a method based on time-dependent perturbation theory and complex rotation to treat the interaction of a short light pulse with a correlated atomic system. The pulse is built from two short and weak pulses with Gaussian envelopes that are centered at two different frequencies. The method is applied to the negative hydrogen ion in the vicinity of a doubly excited resonance and it is shown that the two light pulses can be used to alter the Fano profile of a resonance.
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