  We theoretically investigate the laser wavelength dependence of asymmetric
dissociation of H$_2^+$. It is found that the electron localization in
molecular dissociation is significantly manipulated by varying the wavelength
of the driving field. Through creating a strong nuclear vibration in the
laser-molecular interaction, our simulations demonstrate that the few-cycle
mid-infrared pulse can effectively localize the electron at one of the
dissociating nuclei with weak ionization. Moreover, we show that the observed
phase-shift of the dissociation asymmetry is attributed to the different
population transfers by the remaining fields after the internuclear distances
reach the one-photon coupling point.
