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- ItemWhen does an electron exit a tunneling barrier?(Les Ulis : EDP Sciences, 2013) Shafir, D.; Soifer, H.; Bruner, B.D.; Dagan, M.; Mairesse, Y.; Patchkovskii, S.; Ivanov, M.Y.; Smirnova, O.; Dudovich, N.We probe the dynamics of tunnel ionization via high harmonic generation. We characterize the ionization dynamics in helium atoms, and apply our approach to resolve subtle differences in ionization from different orbitals of a CO 2 molecule.
- ItemThe role of the Kramers-Henneberger atom in the higher-order Kerr effect(Bristol : IOP, 2013) Richter, M.; Patchkovskii, S.; Morales, F.; Smirnova, O.; Ivanov, M.We discuss the connection between strong-field ionization, saturation of the Kerr response and the formation of the Kramers-Henneberger (KH) atom and long-living excitations in intense infrared (IR) external fields. We present a generalized model for the intensity-dependent response of atoms in strong IR laser fields, describing deviations in the nonlinear response at the frequency of the driving field from the standard model. We show that shaping the driving laser pulse allows one to reveal signatures of the excited KH states in the Kerr response of an individual atom.