  Using the time-dependent theory of quantum mechanics, we investigate nuclear
electric dipole responses. The time evolution of a wave function is explicitly
calculated in the coordinate-space representation. The particle continuum is
treated with the absorbing boundary condition. Calculated time-dependent
quantities are transformed into those of familiar energy representation. We
apply the method to a three-body model for 11Li and to the mean-field model for
22O, then discuss properties of E1 response.
