Mainz 2026 – scientific programme
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A: Fachverband Atomphysik
A 41: Interaction with Strong or Short Laser Pulses II
A 41.2: Talk
Friday, March 6, 2026, 11:30–11:45, N 2
Phenomenological rate formulas for over-barrier ionization in strong constant electric fields — •Svea Remme1, Alexander B. Voitkiv1, Georg Pretzler2, and Carsten Müller1 — 1Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf — 2Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf
Over-barrier ionization (OBI) of atoms in strong constant electric fields is studied [1]. To develop an intuitive physical picture behind established empirical formulas in the near OBI regime, we extend corresponding tunneling rates by the combined action of the Stark effect and a widened electron emission angle. Furthermore, we present analytical rate formulas in a far OBI regime which closely agree with numerical data. In result, compact rate expressions describing OBI in a broad range of applied field strengths are obtained. They can be useful in numerical laser-plasma simulation codes to describe elementary ionization events.
[1] S. Remme, A. B. Voitkiv, G. Pretzler, and C. Müller, J. Phys. B: At. Mol. Opt. Phys. 58, 195602 (2025)
Keywords: over-barrier ionization; strong electric fields; Stark effect