An experimental setup for high resolution 10.5 eV laser-based angle-resolved photoelectron spectroscopy using a time-of-flight electron analyzer

TL;DR

This paper introduces a high-resolution laser-based angle-resolved photoelectron spectroscopy setup using a 10.5 eV photon source and a time-of-flight analyzer, enabling comprehensive momentum space mapping with high angular and energy resolution.

Contribution

The paper presents a novel experimental setup combining a 10.5 eV laser source with a ToF analyzer for efficient, high-resolution ARPES measurements covering the entire Brillouin zone.

Findings

Energy resolution better than 5 meV on gold

Successful measurement of Au(111) surface state

Fermi surface mapping of Bi2212

Abstract

We present an experimental setup for laser-based angle-resolved time-of-flight (LARTOF) photoemission. Using a picosecond pulsed laser, photons of energy 10.5 eV are generated through higher harmonic generation in xenon. The high repetition rate of the light source, variable between 0.2-8 MHz, enables high photoelectron count rates and short acquisition times. By using a Time-of-Flight (ToF) analyzer with angle-resolving capabilities electrons emitted from the sample within a circular cone of up to \pm15 degrees can be collected. Hence, simultaneous acquisition of photoemission data for a complete area of the Brillouin zone is possible. The current photon energy enables bulk sensitive measurements, high angular resolution and the resulting covered momentum space is large enough to enclose the entire Brillouin zone in cuprate high-Tc superconductors. Fermi edge measurements on polycrystalline Au shows an energy resolution better than 5 meV. Data from a test measurement of the Au(111) surface state is presented along with measurements of the Fermi surface of the high-Tc superconductor Bi2212.