Complete characterization of multi-channel single photon ionization

TL;DR

This paper demonstrates a method to fully characterize the angular momentum components of photoelectron wavepackets in neon ionization, revealing detailed dynamics of the ionization process using advanced interferometry techniques.

Contribution

It introduces a two-photon interferometry approach to experimentally determine the phases and amplitudes of partial waves in single-photon ionization, enabling complete wavepacket reconstruction.

Findings

Successfully characterized individual partial waves in neon 2p ionization.

Revealed the influence of correlation, centrifugal, and short-range effects on phases.

Enabled time- and space-resolved reconstruction of photoelectron wavepackets.

Abstract

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.