Forthcoming Events

05.09.2021 - 09.09.2021, Potsdam, Germany

Atomic H-target development

    Dr. Jochen Maurer
ETH Zürich
Department of Physics
Institute for Quantum Electronics
Ultrafast Laser Physics
Auguste-Piccard-Hof 1
8093 Zürich
+41 44 633 7024
Project starts   1.1.2017
Project ends    31.12.2018
Goals   To develop a setup for strong field experiments on a clean, cold beam of atomic hydrogen
Abstract    The aim of the project is the development of a setup that allows strong-field ionization experiments on atomic hydrogen.
The main motivation to build such a setup is the measurement of ionization delay times in strong field ionization. The timing of ionization processes has become one of the major topics in attosecond science in recent years. Whereas timing of single photon ionization delay times where investigated by XUV-infrared pump-probe experiments, the attoclock is a tool to investigate time delays in above threshold ionization, i.e. tunnel ionization and multiphoton ionization. It uses the rotating electric field vector of a circularly polarized laser pulses as a reference for the timing of ionization processes. So far, the simplest target for attoclock measurement has been helium, with measurements that indicate a non-vanishing tunnel ionization delay time. However, it has been suggested that attoclock measurements can be influenced by electron correlation effects due to the presence of more than one electron in the atom.
Thus, we need to perform our measurements on the only atomic target with only one electron: atomic hydrogen. For that purpose, we build a new setup for measurements on atomic hydrogen. We construct a vacuum chamber where the atomic hydrogen sample is created, purified and finally crossed by a pulsed laser beam for the strong field ionization process with close-to-circular pulses. The full 3D photoelectron momentum distribution is recorded with a state of the art velocity map imaging spectrometer in combination with tomographic reconstruction. Furthermore, the availability of a cold beam enables us to measure the corresponding proton momentum distribution.
Furthermore, the availability of an atomic hydrogen source allows for fundamental experiments on light-matter interaction. These may include the test of state-of-the art TDSE-codes, as well as experiments to pinpoint multi-electron effects and effects beyond the non-relativistic Schrödinger equation. 

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