Relativistic calculations of angular dependent photoemission time delay

TL;DR

This paper investigates how photoemission time delays vary with emission angle in noble gases using relativistic quantum calculations, revealing strong angular anisotropy and effects of spin-orbit splitting.

Contribution

It provides the first detailed relativistic calculations of angular-dependent photoemission time delays for noble gases, highlighting the influence of Cooper minima and spin-orbit effects.

Findings

Strong angular anisotropy near Cooper minima

Spin-orbit splitting affects time delay near threshold

Relativistic effects are significant in photoemission timing

Abstract

Angular dependence of photoemission time delay for the valence $np_{3/2}$ and $np_{1/2}$ subshells of Ar, Kr and Xe is studied in the dipole relativistic random phase approximation. Strong angular anisotropy of the time delay is reproduced near respective Cooper minima while the spin-orbit splitting affects the time delay near threshold.