Breakdown of the Dipole Approximation in Strong-Field Ionization

Abstract

We report the breakdown of the electric dipole approximation in the long-wavelength limit in strong-field ionization with linearly polarized few-cycle mid-infrared laser pulses at intensities on the order of 10${}^{13}$ W/cm${}^2$. Photoelectron momentum distributions were recorded by velocity map imaging and projected onto the beam propagation axis. We observe an increasing shift of the peak of this projection opposite to the beam propagation direction with increasing laser intensities. From a comparison with semi-classical simulations, we identify the combined action of the magnetic field of the laser pulse and the Coulomb potential as origin of our observations.

12 pages, 4 figures

References in corpus (6)

• Bright Coherent Ultrahigh Harmonics in the keV X-Ray Regime from Mid-Infrared Femtosecond Lasers
• Partitioning of the linear photon momentum in multiphoton ionization
• Under-the-barrier dynamics in laser-induced relativistic tunneling
• Mid-infrared pulse generation via achromatic quasi-phase-matched OPCPA
• The tunneling model of laser-induced ionization and its failure at low frequencies
• Relativistic ionization-rescattering with tailored laser pulses

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• Photon-momentum transfer in diatomic molecules: an ab initio study
• Signatures of magnetic field effects in non-sequential double ionization manifesting as back-scattering for molecules versus forward-scattering for atoms
• Controlling Magnetic and Electric Nondipole Effects with Synthesized Two Perpendicularly Propagating Laser Fields
• Exploring Spin Symmetry-Breaking Effects for Static Field Ionization of Atoms: Is There an Analog to the Coulson-Fischer Point in Bond Dissociation?
• Relativistic analytical R-matrix (ARM) theory for strong-field ionization
• Increasing ion yield circular dichroism in femtosecond photoionisation using optimal control theory
• Nondipole photoelectron momentum shifts in strong-field ionization with mid-infrared laser pulses of long duration