Revealing the target electronic structure with under-threshold RABBIITT

TL;DR

This paper demonstrates that under-threshold RABBITT can accurately reveal the electronic structure of atoms by resonating with bound states, providing detailed energy levels and oscillator strengths.

Contribution

It introduces the use of under-threshold RABBITT to faithfully map discrete atomic energy levels and oscillator strengths, enhancing electronic structure analysis.

Findings

Under-threshold RABBITT resonates with bound states.

The method accurately maps energy levels and oscillator strengths.

Demonstrated on neon atom with XUV and IR pulses.

Abstract

The process of reconstruction of attosecond beating by interference of two-photon transitions (RABBITT) reveals the target atom electronic structure when one of the transitions proceeds from below the ionization threshold. Such an under-threshold RABBITT resonates with the target bound states and thus maps faithfully the discrete energy levels and the corresponding oscillator strengths. We demonstrate this sensitivity by considering the Ne atom driven by the combination of the XUV and IR pulses at the fundmanetal laser frequency in the 800 and 1000~nm ranges.