# Heidelberg 2015 – wissenschaftliches Programm

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# A: Fachverband Atomphysik

## A 7: Poster: Atomic systems in external fields

### A 7.6: Poster

### Montag, 23. März 2015, 17:00–19:00, C/Foyer

**Low-energy electrons in strong high frequency pulses** — •Qi-Cheng Ning, Koudai Toyota, Ulf Saalmann, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany

In the tunneling ionization regime atoms and molecules, singly ionized by strong mid-infrared laser pulse, produce an unexpected low-energy structure [1], which can be explained by classical soft recollisions [2].

Surprisingly, low-energy electrons have been found numerically also in a higher-frequency regime, where they originate from a pure quantum effect [3]. Its physical picture can now be depicted by the non-adiabatic evolution of the system in a short pulse with duration comparable to the characteristic time scale of the bound electron [4]. We study this case also in a two-electron system. There a low-energy peak structure in the doubly-ionized electron spectrum has been confirmed and studied in terms of electron correlation.

[1] C. I. Balga et al., Nat. Phys. 5, 335 (2009). [2] A. Kastner, U. Saalmann, and J. M. Rost, Phys. Rev. Lett. 108, 033201 (2012). [3] K, Toyota, O. I. Tolstikhin, T. Morishita, and S. Watanabe, Phys. Rev. Lett. 103, 153003 (2009). [4] K. Koudai, U. Saalmann, and J. M. Rost, arXiv.1408.4541.