Complex dilation for time-dependent phenomena in driven helium

The electromagnetically driven helium atom defines a paradigmatic scenario of a fragmenting quantum system, characterized by high spectral densities and decay channels into multiple continua. A powerful tool to access the spectral structure underlying the field-induced excitation and fragmentation process is provided by complex dilation of the Hamiltonian, which uncovers the pole structure of the resolvent operator. We summarize the current status of applications of complex dilation techniques in this specific physical context, and discuss novel perspective, such as the impact of the interelectronic repulsion on dynamical localization effects in the excitation process.