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A: Fachverband Atomphysik

A 35: Attosecond physics

A 35.4: Talk

Thursday, March 3, 2016, 15:45–16:00, f107

Tunneling ionization time resolved by backward propagation — •Hongcheng Ni, Ulf Saalmann, and Jan M. Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany

We assess under which circumstances the attoclock can be used to determine the tunneling ionization time. This is achieved by a novel backward-propagation method, which involves a full quantum treatment of the tunneling process forward in time, followed by a classical backward propagation to identify the tunneling parameters. We find that, if the tunneling concept applies, the corresponding ionization time is around pulse center for single active electrons in helium and hydrogen. The range of validity, quite different for the two atoms, is limited towards low laser intensities by multiphoton ionization and towards high intensities by above-barrier ionization.