Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 10: Interaction with strong or short laser pulses
A 10.1: Poster
Dienstag, 15. März 2022, 16:30–18:30, P
Adiabatic models for the bicircular attoclock — •Paul Winter and Manfred Lein — Leibniz University Hannover
Using counter-rotating bicircular laser fields in an attoclock setup has some big advantages when studying ionization dynamics in strong fields: The field is quasilinear in the close temporal vicinity of the maximal electric field, where ionization is most probable, but nevertheless rescattering is avoided in contrast to purely linearly polarized fields.
The well-defined direction of the field at the ionization time enables us to look at orientation dependencies in the ionization of molecules. An important parameter range is the adiabatic limit, i.e. small Keldysh parameter γ=√2Ipω/E≪ 1. In this regime the ionization can be described by a two step model, where the electron travels classically after tunneling out. A crucial factor in these adiabatic models is the location of the exit point where the classical motion starts. The main observable is the attoclock shift of the electron final momentum due to the attractive Coulomb force towards the parent ion.
We compare two-dimensional simulations of the time-dependent Schrödinger equation for HeH+ and H2 to results from adiabatic models. A connection of the attoclock shifts to molecular properties such as dipole moment and polarizability arises due to the angle-dependent Stark shift of the ionisation potential.