Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

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.

Attosecond time delays in the valence photoionization of xenon and iodine at energies degenerate with core emissions

“…Strong negative delays near the resonance indicate accelerated emissions of the electron for both Xe and I. This corroborates to the general expectation of a collective-type resonance environment in which electrons feel transient repulsion as the emission process becomes favored [3]. In contrast, an opposite temporal trend is displayed near the CM region where the delays appear positive.…”

Effect of attochirp on attosecond streaking time delay in photoionization of atoms

“…While the time delays for Ne and Ar( s 3 ) increase rather smoothly as a function of XUV frequency, a pronounced minimum appears around the Cooper minimum for Ar( p 3 ). The minimum arises from the Wigner-Smith time delay and is related to the change of sign in the dipole matrix element [43][44][45][46][47].…”

Photoionization of Xe 5s: angular distribution and Wigner time delay in the vicinity of the second Cooper minimum

“…Second, we report results of photoionization time-delay studies. Wigner-Eisenbud-Smith time delay [34][35][36], τ WES , is known to be affected strongly by correlation and relativistic interactions, especially in the region of Cooper minima [37][38][39][40][41][42][43][44]. A few photoionization time delay studies on atomic xenon have been reported [41][42][43][44][45].…”

“…Wigner-Eisenbud-Smith time delay [34][35][36], τ WES , is known to be affected strongly by correlation and relativistic interactions, especially in the region of Cooper minima [37][38][39][40][41][42][43][44]. A few photoionization time delay studies on atomic xenon have been reported [41][42][43][44][45]. Most recently, studies of the angular dependence of photoionization time delay of Xe 5s in the near threshold region, in the vicinity of the FCM have been examined theoretically [44].…”