Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 25: Poster IV
A 25.29: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent A
Partial-wave representation of the strong-field approximation: length versus velocity gauge — Fang Liu1,2,3, •Kefei Zou1,2,3, and Stephan Fritzsche1,2,3 — 1Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany — 2Theoretisch-Physikalisches Institut, Friedrich- Schiller-Universität Jena, 07743 Jena, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
The strong-field approximation (SFA) is a commonly used method to study ionization of atoms by intense laser field. Recently, a reformulation of the SFA in terms of partial waves expansion has been presented in [Phys. Rev. A 102, 053108 (2020)]. In this contribution, we investigate the above threshold ionization of the atom driven by elliptically polarized light pulse. In addition, we calculate the angular distribution of photoelectrons in both velocity and length gauge. Our results show differences between the two gauges. Moreover, we find that the angular distribution of the photoelectrons calculated in length gauge are in better agreement with the experimental data than those from velocity gauge. This highlights the importance of choosing the gauge to perform theoretical calculations in SFA.