4/23/2024 0 Comments Intensity of laser light equation![]() ![]() Electric nondipole effect in strong-field ionization. Relativistic nondipole effects in strong-field atomic ionization at moderate intensities. Probing the ionization wave packet and recollision dynamics with an elliptically polarized strong laser field in the nondipole regime. Breakdown of the dipole approximation in strong-field ionization. Strong field theories beyond dipole approximations in nonrelativistic regimes. Photon momentum sharing between an electron and an ion in photoionization: from one-photon (photoelectric effect) to multiphoton absorption. Coulomb effects in photon-momentum partitioning during atomic ionization by intense linearly polarized light. Under-the-barrier dynamics in laser-induced relativistic tunneling. Klaiber, M., Yakaboylu, E., Bauke, H., Hatsagortsyan, K. Magnetic fields alter strong-field ionization. Subcycle time-resolved nondipole dynamics in tunneling ionization. ![]() Theory of subcycle linear momentum transfer in strong-field tunneling ionization. Sub-cycle time resolution of multi-photon momentum transfer in strong-field ionization. Partitioning of the linear photon momentum in multiphoton ionization. Zeeman effect in strong-field ionization. Zeeman effect induced by intense laser light. Limits on tunneling theories of strong-field ionization. Observation of electric quadrupole transitions in multiphoton ionization. Electric quadrupole transitions in multiphoton ionization. Enhanced nondipole effects in low energy photoionization. Electric-dipole-quadrupole interference of overlapping autoionizing levels in photoelectron energy spectra. Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon. Cooper minima: a window on nondipole photoionization at low energy. Non-dipole effects in time delay of photoelectrons from atoms, negative ions, and endohedrals. Zeptosecond birth time delay in molecular photoionization. Observation of photoion backward emission in photoionization of He and N 2. Photoelectron-angular-distribution parameters for rare-gas subshells. ![]() Relative subshell cross sections and angular distributions of photoelectrons. Photo-ionization of krypton between 3 eV. These fundamental findings are supported by ab initio calculations based on the non-dipole time-dependent Schrödinger equation. Furthermore, we measure a time delay of 15 ± 10 as between the electric-dipole and electric-quadrupole transitions by resolving the asymmetry of the photoelectron forward–backward yields with attosecond resolution. Using a self-referenced attosecond photoelectron interferometry on helium atoms, we resolve the electron subcycle motion along the light propagation direction in the 15 pm range driven by the magnetic component of a near-infrared laser field. Here we advance attosecond time-resolved spectroscopy into the non-dipole interaction regime. Non-dipole effects in photoionization were revealed to be tiny from the infrared to the soft X-ray domains, and all non-dipole observations reported so far were limited to single-pulse, single-colour measurements. Light–matter interactions are usually described within the electric-dipole approximation, where the magnetic-field component and the spatial variation of the light electric field over the relevant electronic length scales are both ignored. ![]()
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