Advances in attosecond science have led to a wealth of important discoveries in atomic,
molecular, and solid-state physics and are progressively directing their footsteps toward …

Free-electron lasers produce extremely brief, coherent, and bright laser-like photon pulses
that allow to image matter at atomic resolution and at timescales faster than the …

Following structural dynamics in real time is a fundamental goal towards a better
understanding of chemical reactions. Recording snapshots of individual molecules with …

Ultrafast isomerization of acetylene cations ([HC= CH]+) in the low-lying excited A Σ g+ 2
state, populated by the absorption of extreme ultraviolet (XUV) photons (38 eV), has been …

Free-electron lasers are fourth-generation light sources that deliver extremely intense (>
1012 photons per pulse), ultrashort (∼ 10− 14 s= 10 fs) light pulses at up to kilohertz …

Upon ionization, water forms a highly acidic radical cation H2O+· that undergoes ultrafast
proton transfer (PT)—a pivotal step in water radiation chemistry, initiating the production of …

With the advent of attosecond light pulses at the beginning of this century, the possibility to
perform real‐time observations of electron motion in molecules has spurred impressive …

Over the last 20 years, XUV and X-ray free-electron lasers have enabled a wide variety of
time-resolved experiments that have dramatically advanced our understanding of ultrafast …

Present performance and future development of the free-electron lasers (FELs) in Hamburg—
FLASH for the extreme ultraviolet and the European XFEL for the soft and hard x-ray …

Attosecond science, born at the beginning of this century with the generation of the first
bursts of light with durations shorter than a femtosecond, has opened the way to look at …