Vacuum space charge effect in laser-based solid-state photoemission spectroscopy

TL;DR

This paper systematically investigates the space charge effects in laser-based solid-state photoemission spectroscopy, providing experimental data and simulations to inform the design of advanced spectroscopic setups and light sources.

Contribution

It offers a comprehensive measurement and analysis of space charge effects in the few-ps laser pulse regime, serving as a benchmark for simulations and experimental design.

Findings

Characterized Fermi edge broadening and shift as functions of spot size, laser power, and emission angle.

Provided a benchmark for N-body numerical simulations of space charge effects.

Compared experimental results with different photoemission regimes.

Abstract

We report a systematic measurement of the space charge effect observed in the few-ps laser pulse regime in laser-based solid-state photoemission spectroscopy experiments. The broadening and the shift of a gold Fermi edge as a function of spot size, laser power, and emission angle are characterized for pulse lengths of 6 ps and 6 eV photon energy. The results are used as a benchmark for an $N$-body numerical simulation and are compared to different regimes used in photoemission spectroscopy. These results provide an important reference for the design of time- and angle-resolved photoemission spectroscopy setups and next-generation light sources.