  Ionization of atoms and molecules by absorption of a light pulse results in
electron wavepackets carrying information on the atomic or molecular structure
as well as on the dynamics of the ionization process. These wavepackets can be
described as a coherent sum of waves of given angular momentum, called partial
waves, each characterized by an amplitude and a phase. The complete
characterization of the individual angular momentum components is
experimentally challenging, requiring the analysis of the interference between
partial waves both in energy and angle. Using a two-photon interferometry
technique based on extreme ultraviolet attosecond and infrared femtosecond
pulses, we characterize the individual partial wave components in the
photoionization of the 2p shell in neon. The study of the phases of the angular
momentum channels allows us to unravel the influence of short-range,
correlation and centrifugal effects. This approach enables the complete
reconstruction of photoionization electron wavepackets in time and space,
providing insight into the photoionization dynamics.
