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 …

Laser excitation of nanometer-sized atomic and molecular clusters offers various
opportunities to explore and control ultrafast many-particle dynamics. Whereas weak laser …

We review the first ten years of attosecond science with a selection of recent highlights and
trends and give an outlook on future directions. After introducing the main spectroscopic …

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

Experiments on atoms in intense laser pulses and the corresponding exact ab initio
solutions of the time-dependent Schrödinger equation (TDSE) yield photoelectron spectra …

We present a semiclassical two-step model for strong-field ionization that accounts for path
interferences of tunnel-ionized electrons in the ionic potential beyond perturbation theory …

As a fundamental property of the electron, the spin plays a decisive role in the electronic
structure of matter, from solids to molecules and atoms, for example, by causing magnetism …

With a classical ensemble model that includes electron correlations during the whole
ionization process, we investigate strong-field sequential double ionization of Ar by …

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 …

A review is presented of the rescattering plateau in laser-induced above-threshold ionization
and its various features as they were discovered over time. Several theoretical explanations …