Sub-barrier pathways to Freeman resonances
- URL: http://arxiv.org/abs/2009.06712v1
- Date: Mon, 14 Sep 2020 19:52:32 GMT
- Title: Sub-barrier pathways to Freeman resonances
- Authors: Michael Klaiber and Karen Z. Hatsagortsyan and Christoph H. Keitel
- Abstract summary: An intuitive model is put forward which explains the mechanism of the intermediate population of excited states during nonadiabatic tunneling ionization.
The enhancement of ionization is shown to arise due to the constructive interference of contributions into the excitation amplitudes originating from different laser cycles.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The problem of Freeman resonances [R. R. Freeman \textit{et al.}, Phys. Rev.
Lett. \textbf{59}, 1092 (1987)] when strong field ionization is enhanced due to
the transient population of excited states during the ionization, is revisited.
An intuitive model is put forward which explains the mechanism of the
intermediate population of excited states during nonadiabatic tunneling
ionization via the under-the-barrier recollision and recombination. The
theoretical model is based on perturbative strong-field approximation (SFA),
where the sub-barrier bound-continuum-bound pathway is described in the
second-order SFA, while the further ionization from the excited state by an
additional perturbative step. The enhancement of ionization is shown to arise
due to the constructive interference of contributions into the excitation
amplitudes originating from different laser cycles. The applied model provides
an intuitive understanding of the electron dynamics during a Freeman resonance
in strong-field ionization, as well as means of enhancing the process and
possible applications to related processes.
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