Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 38: Atoms in Strong Fields II

A 38.4: Talk

Friday, March 10, 2017, 15:15–15:30, N 2

Tunneling exit characteristics from classical backpropagation of an ionized wavepacket — •Hongcheng Ni, Ulf Saalmann, and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden

We study the tunneling exit parameters of single active electron in the helium atom with the recently proposed backpropagation method [Phys. Rev. Lett. 117, 023002 (2016)] upon different criteria towards defining tunneling ionization. We find, if tunneling ionization is characterized by the emergence of electrons at certain predefined distances from the ion, the tunneling exit parameters extracted have a number of inconsistencies; while if tunneling ionization is defined by a vanishing momentum in the instantaneous field direction, which captures both adiabatic and nonadiabatic tunneling dynamics, the tunneling exit parameters retrieved are intuitive and easy to understand. This analysis has important implications towards future numerical simulations of the attoclock experiments that commonly used trajectory-based methods starting from assumed exit time and position are imprecise. Thereby, we provide a mapping technique that links attoclock experimental observable to the intrinsic tunneling exit time.