Under-the-tunneling-barrier recollisions in strong field ionization
Abstract
A new pathway of strong laser field induced ionization of an atom is identified which is based on recollisions under the tunneling barrier. With an amended strong field approximation, the interference of the direct and the under-the-barrier recolliding quantum orbits are shown to induce a measurable shift of the peak of the photoelectron momentum distribution. The scaling of the momentum shift is derived relating the momentum shift to the tunneling delay time according to the Wigner concept. This allows to extend the Wigner concept for the quasistatic tunneling time delay into the nonadiabatic domain. The obtained corrections to photoelectron momentum distributions are also relevant for state-of-the-art accuracy of strong field photoelectron spectrograms in general.
Keywords
Cite
@article{arxiv.1705.05764,
title = {Under-the-tunneling-barrier recollisions in strong field ionization},
author = {Michael Klaiber and Karen Z. Hatsagortsyan and Christoph H. Keitel},
journal= {arXiv preprint arXiv:1705.05764},
year = {2018}
}