Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Atomic Systems in External Fields I
A 6.4: Vortrag
Montag, 11. März 2024, 17:45–18:00, HS 1098
Relativistic strong-field ionization including atomic polarization and Stark-shift — •Michael Klaiber1, John S Briggs2, Karen Z Hatsagortsyan1, and Christoph H Keitel1 — 1Max Planck Institute for Nuclear Physics — 2Universität Freiburg
Relativistic theory of strong-field ionization applicable across the regimes of the deep-tunneling up to the over-barrier ionization (OTBI) is developed, incorporating the effects of the polarization of the atomic bound state and the Stark-shift in an ultrastrong laser field. The theory addresses the order of magnitude discrepancy of the ionization yield at OTBI regime calculated via the numerical solution of the Klein-Gordon equation [1] and the recent experimental result [2] with respect to the state-of-the-art quasiclassical theory of Perelomov-Popov-Terent'ev for strong-field ionization or the relativistic R-matrix theory [3]. While the developed theory employs a simplified Keldysh-like approach describing the ionization as a quantum jump from the bound state to the continuum at a specific transition time, the improved performance is achieved by accounting for the bound state distortion in the laser field. In the nonrelativistic limit, the theory reproduces the well-known fitting formula to numerical calculations for the ionization rate of OTBI.
[1] B. Hafizi et al., Phys. Rev. Lett. 118, 133201 (2017)
[2] A. Yandow et al., arXiv:2306.09620
[3] M. Klaiber et al., Phys. Rev. A 107, 023107 (2023)
Keywords: relativistic strong field ionization