We report on the observation of subcycle interferences of electron wave packets released during strong field ionization of $\text{H}_{2}$ with cycle-shaped two-color laser fields. With a reaction microscope we measure three-dimensional momentum distributions of photoelectrons correlated with either $\text{H}_{2}^{+}$ or protons within different energy ranges generated by dissociation of $\text{H}_{2}^{+}$. We refer to these different types of photoelectrons as channels. Our results show that the subcycle interference structures of electron wave packets are very sensitive to the cycle shape of the two-color laser field. We explain this behavior by the dependence of the ionization time within an optical cycle on the shape of the laser field cycle. The subcycle interference structures can be further used to obtain insight into the subcycle dynamics of molecules during strong field interaction.

Based on realistic numerical simulations of the three-dimensional time-dependent Schrödinger equation describing a hydrogen atom interacting with a strong electromagnetic field, the influence of the magnetic component is studied. The same computational techniques can be applied to the case of strong field photoionization as well as to the case of ionization by an incident relativistic heavy ion. One of the main consequences, in the strong-laser-field case, is the presence of true even harmonics of the incoming field. In the heavy ion impact, the asymmetry of the wave function reveals the importance of the nondipole nature of the interaction.