The emerging application of attosecond techniques to molecular systems allows the role of
electronic coherence in the control of chemical reactions to be investigated. Prompt …

The history and current status of the Keldysh theory of strong field ionization are reviewed.
The focus is on the fundamentals of the theory, its most important applications and those …

The first hundred attoseconds of the electron dynamics during strong field tunneling
ionization are investigated. We quantify theoretically how the electron's classical trajectories …

The question of how long it takes a particle to tunnel through a potential barrier has been a
subject of intense theoretical debate for the last 80 years. In this decade of attosecond …

Photoelectron holography constitutes a powerful tool for the ultrafast imaging of matter, as it
combines high electron currents with subfemtosecond resolution, and gives information …

In this review, we will focus on the theoretical aspects in observing and controlling the
electronic dynamics in few-electron atoms and molecules by attosecond pulses in different …

We investigate experimentally the validity of proposed theories extending the tunneling
approximation towards the multiphoton regime in strong-field ionization of helium. We …

The last decade has seen an intense renewed debate on tunnelling time, both from a
theoretical and an experimental perspective. Here, we review recent developments and new …

Tunnel ionization belongs to the fundamental processes of atomic physics. The so-called
two-step model, which describes the ionization as instantaneous tunneling at the electric …

Electron–positron pair production due to the decay of vacuum in ultrastrong laser fields is an
interesting topic which is revived recently because of the rapid development of current laser …