Angular dependent resonant photoemission processes at the 2p thresholds in nickel metal

TL;DR

This study investigates how the angular dependence of resonant photoemission at the 2p thresholds in nickel reveals interference effects and the nature of satellite features, enhancing understanding of electron correlation in metals.

Contribution

It provides detailed measurements of angular dependence and interference effects in resonant photoemission of nickel near the 2p thresholds, revealing new insights into satellite origins.

Findings

Significant intensity enhancement of the 6-eV satellite at resonance.

Angular asymmetries differ between valence band and satellite.

Evidence of interference effects up to the resonance maximum.

Abstract

Angle-resolved valence-band resonant photoemission of nickel metal has been measured close to the 2p core-level thresholds with synchrotron radiation. The well-known 6-eV correlation satellite has an intensity enhancement of about two orders of magnitude at resonance. The angular dependence of the photoemission intensity has been studied as function of photon energy and provides unambiguous evidence for interference effects all the way up to the resonance maximum. The observation of different angular asymmetries, {\beta}, for the valence band and the satellite is discussed in connection to the origin of the resonant photoemission process and the character of the satellite.