Photorecombination Time Delays characterization with all-optical method

Measuring the photoionization time delay between electrons from different orbitals is one of the most important accomplishments of attosecond science. Photoionization time delay is usually measured using single attosecond XUV pulses in a streaking experiment or using an attosecond XUV pulse train in a RABBIT experiment. However, the measured delay is the superposition of all possible contributions to ionization and may include delays associated with multiple channels, the ionizing pulse, ionic and electronic structural effects, multielectron interaction, and Coulomb-laser coupling. Deconvolving these disparate contributions is difficult. Here, we show that, by characterizing recollision dynamics entirely optically, photorecombination time delays from individual pathways to recombination can be measured without obfuscation from ionic structural and propagation effects. This work opens a path to the all-optical measurement of ultrafast electron dynamics and photorecombination time delays due to electronic structure, multielectron interaction, and strong-field driven dynamics in complex molecular systems and correlated solid-state systems.