Solution of the time-dependent Dirac equation for describing multiphoton ionization of highly-charged hydrogenlike ions

Abstract

A theoretical study of the intense-field multiphoton ionization of hydrogenlike systems is performed by solving the time-dependent Dirac equation within the dipole approximation. It is shown that the velocity-gauge results agree to the ones in length gauge only if the negative-energy states are included in the time propagation. On the other hand, for the considered laser parameters, no significant difference is found in length gauge if the negative-energy states are included or not. Within the adopted dipole approximation the main relativistic effect is the shift of the ionization potential. A simple scaling procedure is proposed to account for this effect.

8 pages, 5 figures

References in corpus (4)

• Alignment-Dependent Ionization of N${}_2$, O${}_2$, and CO${}_2$ in Intense Laser Fields
• Alignment-Dependent Ionization of Molecular Hydrogen in Intense Laser Fields
• A 4-Component Dirac Theory of Ionization of Hydrogen Molecular Ion in a Super-Intense Laser Field
• Accurate photoionisation cross section for He at non-resonant photon energies

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• Relativistic analytical R-matrix (ARM) theory for strong-field ionization
• Computational relativistic quantum dynamics and its application to relativistic tunneling and Kapitza-Dirac scattering
• Relativistic effects in ionization of heavy hydrogen-like ions by short X-ray pulses