Rostock 2019 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
A: Fachverband Atomphysik
A 7: Interaction with strong or short laser pulses
A 7.5: Talk
Monday, March 11, 2019, 15:15–15:30, S HS 3 Physik
Evidence of Freeman resonances in intense two-color counter-rotating laser fields — •Philipp Stammer1,2, Felipe Morales1, Olga Smirnova1,2, and Misha Ivanov1,3,4 — 1Max Born Institut — 2Technische Universität Berlin — 3Humboldt Universität Berlin — 4Imperial College London
We present results of the numerical solution of the TDSE for the Hydrogen atom, and a short range Yukawa potential, exposed to an intense bi-circular laser field. We study the photoelectron angular distributions after strong field ionization.
In the case of the Yukawa potential, we observe a 3-fold symmetry, imposed by the bi-circular field. Additionally we observe many features predicted by SFA for linear fields, including Low Energy Structures due to re-scattered trajectories.
However, when including the Coulomb potential new features appear, and the 3-fold symmetry can be broken. In particular, we focus on the first ATI peak, where a more complex pattern arises. This pattern is born out of the field induced resonant ionization of states shifted by the ponderomotive potential, or Freeman resonances, and could be used to identify the electron dynamics prior to ionization.