Heidelberg 2015 – scientific programme
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A: Fachverband Atomphysik
A 16: Interaction with strong or short laser pulses I
A 16.2: Talk
Tuesday, March 24, 2015, 14:45–15:00, C/kHS
Population of doubly excited states in the tunneling regime — •Lutz Fechner1, Nicolas Camus1, Andreas Krupp1, Joachim Ullrich2, Thomas Pfeifer1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Physikalisch-Technische Bundesanstalt, Braunschweig
The mechanism of frustrated tunneling ionization (FTI) has been identified recently as being responsible for the population of Rydberg states in strong laser fields in the tunneling regime [1]. Using a Reaction Microscope we obtained highly resolved electron momentum distributions resulting from ionization of noble gases at various wavelengths from 400 to 1600 nm. We present unique features visible in the low momentum regions that arise from autoionizing doubly excited states. Possible population scenarios include the excitation of the electronic core by the resonant recapturing of a slow, recolliding electron and thus a possible connection to dielectronic recombination processes [2,3].
[1] T. Nubbemeyer et al., Phys. Rev. Lett. 101, 233001 (2008)
[2] J.B.A. Mitchell et al., Phys. Rev. Lett. 50, 335 (1983)
[3] D.S. Belic et al., Phys. Rev. Lett. 50, 339 (1983)