Energy Dependence of Cu L2,3 Satellites using Synchrotron Excited X-ray Emission Spectroscopy

TL;DR

This study investigates the energy dependence of copper L2,3 satellite features using synchrotron X-ray emission spectroscopy, revealing how satellite intensities change with excitation energy and identifying underlying processes.

Contribution

It provides a detailed analysis of satellite intensity variations and separates high-energy satellite features, offering new insights into Cu electronic structure and excitation processes.

Findings

Satellite intensity increases slowly with excitation energy due to shake-up and shake-off.

A rapid increase in satellite intensity occurs at the L2 threshold due to Coster-Kronig processes.

Self-absorption effects are negligible in the experimental setup.

Abstract

The L2,3 X-ray emission of Cu metal has been measured using monochromatic synchrotron radiation. The self-absorption effect in the spectra is shown to be very small in our experimental geometry. From the quantitative analysis of spectra recorded at different excitation energies, the L3/L2 emission intensity ratio and the partial Auger-width are extracted. High-energy satellite features on the L3 emission line are separated by a subtraction procedure. The satellite intensity is found to be slowly increasing for excitation energies between the L3, L2 and L1 core-level thresholds due to shake-up and shake-off transitions. As the excitation energy passes the L2 threshold, a step of rapidly increasing satellite intensity of the L3 emission is found due to additional Coster-Kronig processes.