Attosecond delay of xenon $4d$ photoionization at the giant resonance and Cooper minimum

TL;DR

This paper predicts attosecond time delays in xenon 4d photoionization involving the giant resonance and Cooper minimum, highlighting electron correlation effects and suggesting experimental verification.

Contribution

It introduces a Kohn-Sham TDDFT approach to accurately predict photoionization delays in xenon, emphasizing electron correlations' role at specific spectral features.

Findings

Delay signatures at the giant resonance and Cooper minimum are identified.

Electron correlations are crucial for accurate delay predictions.

Results align qualitatively with existing experimental observations.

Abstract

A Kohn-Sham time-dependent local-density-functional scheme is utilized to predict attosecond time delays of xenon 4d photoionization that involves the 4d giant dipole resonance and Cooper minimum. The fundamental effect of electron correlations to uniquely determine the delay at both regions is demonstrated. In particular, for the giant dipole resonance, the delay underpins strong collective effect, emulating the recent prediction at C60 giant plasmon resonance [T. Barillot et al, Phys. Rev. A 91, 033413 (2015)]. For the Cooper minimum, a qualitative similarity with a photorecombination experiment near argon 3p minimum [S. B. Schoun et al, Phys. Rev. Lett. 112, 153001 (2014)] is found. The result should encourage attosecond measurements of Xe 4d photoemission.