Two-XUV-photon double ionization of Neon studied at the Extreme Light Infrastructure (ELI-ALPS)

TL;DR

This study combines experimental and theoretical approaches to investigate two-XUV-photon double ionization of Neon at ELI-ALPS, revealing insights into electron correlation and ionization dynamics using intense attosecond pulse trains.

Contribution

It provides the first combined experimental and theoretical analysis of Neon double ionization with XUV photons at ELI-ALPS, demonstrating the feasibility of XUV-pump-XUV-probe techniques.

Findings

Observation of doubly charged Neon state induced by 40 eV photons

Theoretical modeling using second-order time-dependent perturbation theory

Potential for attosecond pulse metrology and time-resolved electron dynamics studies

Abstract

Two XUV-photon double ionization of Ne, induced by an intense few-pulse attosecond train with a ~ 4 fs envelope duration is investigated experimentally and theoretically. The experiment is performed at ELI-ALPS utilizing the recently constructed 10 Hz gas phase high-order harmonic generation SYLOS GHHG-COMPACT beamline. A total pulse energy up to ~1 {\mu}J generated in Argon in conjunction with high reflectivity optics in the XUV region, allowed the observation of the doubly charged state of Ne induced by 40 eV central XUV photon energies. The interaction of the intense attosecond pulse train with Ne is also theoretically studied via a second-order time dependent perturbation theory equations-of-motion. The results of this work, combined with the feasibility of conducting XUV-pump-XUV-probe experiments, constitute a powerful tool for many potential applications. Those include attosecond pulse metrology as well as time resolved investigations of the dynamics underlying direct and sequential double ionization and their electron correlation effects.