Abstract
XUV nonlinear spectroscopy has recently discovered that there is more than one collective dipole resonance state in the energy range of the giant dipole resonance (GDR) of atomic Xe. This resonance-state substructure, hidden in the linear regime, raises imminent questions regarding our understanding of the collective electronic behavior of Xe, which has been largely founded on linear spectroscopic studies. Here, we approach the collective response of Xe from a new perspective: we study directly the resonance eigenstates, and then analyze their spectroscopic manifestations. We find that linear spectroscopy captures only partial information on the resonance substructure as a result of quantum interferences. Moreover, we show that the resonance state dominating the GDR in linear spectroscopy has no adiabatic connection to the resonance state governing the corresponding cross section when multielectron interactions are neglected. Going beyond the dipole-allowed correlated electronic structure, we predict the existence of collective multipole resonances of Xe. Unlike any known collective feature in atoms, these resonances live exceptionally long (more than 100 attoseconds), thus providing a new playground for studying the collective nonlinear response of Xe using advanced light sources.
Highlights
The one-particle approximation can well describe a multielectron atom in several aspects, it fails conspicuously in some cases to capture the many-body nature of an atom
Does it lead to a striking enhancement in the highharmonic generation (HHG) spectrum of Xe driven by intense NIR lasers [15, 16], but it creates an unusual charge-state distribution of Xe irradiated by XUV free-electron lasers (FELs) [17, 18]
Summarizing, this paper tackles the collective resonances in the 4d subshell of Xe at the most fundamental level of the correlated electronic structure
Summary
XUV nonlinear spectroscopy has recently discovered that there is more than one collective dipole and DOI. We approach the collective response of Xe from a new perspective: we study directly the resonance eigenstates, and analyze their spectroscopic manifestations. Going beyond the dipole-allowed correlated electronic structure, we predict the existence of collective multipole resonances of Xe. Unlike any known collective feature in atoms, these resonances live exceptionally long (more than 100 attoseconds), providing a new playground for studying the collective nonlinear response of Xe using advanced light sources
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
