Diagrammatic approach to attosecond delays in photoionization
Diagrammatic approach to attosecond delays in photoionization
We study laser-assisted photoionization by attosecond pulses using a time-independent formalism based on diagrammatic many-body perturbation theory. Our aim is to provide an ab initio route to the ``delays'' for this above-threshold ionization process, which is essential for a quantitative understanding of attosecond metrology. We present correction curves for characterization …