Extended energy range analysis for angle-resolved time-of-flight photoelectron spectroscopy

Abstract

An approximation method for electrostatic time-of-flight (ToF) spectroscopy on photoelectrons distributed over a wide energy range is presented. This method is an extension of conventional analysis and aims at specific energy and angular regions, where distinctly different emission angles and energies are mapped to the same ToF and detector position by the spectrometer. The general formulation and the systematic errors are presented, and a practical example is demonstrated for photoelectrons from Ag(001) with kinetic energies of 0.5–25 eV.

The CoESCA station at BESSY: Auger electron-Photoelectron coincidences from surfaces demonstrated for Ag MNN

“…For the present analysis, it is sufficient to account for this in post-processing by correcting the spectral intensities with a linear transmission function such, that for the singles photoelectron spectra (PES) the ratio of M 5 peak area over M 4 peak area would match the literature value of 0.67 [29]. In a recent study, the potential to operate angular resolved time of flight spectrometers beyond the standard limits and extending the time of flight range which can be analysed has been shown [45]. The ArTOF 10k detector, used for measuring the Auger spectra, was operated well within its specifications, with a constant transmission function.…”

Classification of the symmetry of photoelectron dichroism broken by light

“…The experimental setup is unique in that the entity of the sample and electron analyzer has the symmetry of C ∞v during the data acquisition. The key to the highsymmetry setup is twofold: (1) We prepared a sample that is effectively C ∞v ; (2) we used a slit-less photoelectron analyzer [42][43][44][45][46][47].…”