Аннотация:Ultrafast spectroscopy with attosecond resolution has enabled the real time observation of
ultrafast electron dynamics in atoms, molecules and solids. These experiments employ
attosecond pulses or pulse trains and explore dynamical processes in a pump–probe scheme
that is selectively sensitive to electronic state of matter via photoelectron or XUV absorption
spectroscopy or that includes changes of the ionic state detected via photo-ion mass
spectrometry. Here, we demonstrate how the implementation of combined photo-ion and
absorption spectroscopy with attosecond resolution enables tracking the complex multidimensional
excitation and decay cascade of an Auger auto-ionization process of a few
femtoseconds in highly excited krypton. In tandem with theory, our study reveals the role of
intermediate electronic states in the formation of multiply charged ions. Amplitude tuning of
a dressing laser field addresses different groups of decay channels and allows exerting
temporal and quantitative control over the ionization dynamics in rare gas atoms.
DOI: 10.1038/s41467-018-03122-1