Plasma discharge lamps are widely utilized in the practice of angle-resolved photoemission spectroscopy (ARPES) experiments as narrow-linewidth ultraviolet photon sources. However, many emission lines such as Ar-I, Ne-I, and Ne-II have closely spaced doublet emission lines, which result in superimposed replica on the measured ARPES spectra. Here, we present a simple method for subtracting the contribution of these doublet emission lines from photoemission spectra. Benchmarking against ARPES spectra of well-characterized 2D materials, we demonstrate that this algorithm manages to subtract the doublet signal and reproduce the key features of the monochromated He-Iα spectra in a physically sound manner that reliably reproduces quantifiable dispersion relations and quasiparticle lifetimes.
@article{arxiv.2303.07531,
title = {An Algorithm for Subtraction of Doublet Emission Lines in Angle-Resolved Photoemission Spectroscopy},
author = {Yaoju Tarn and Mekhola Sinha and Christopher Pasco and Darrell G. Schlom and Tyrel M. McQueen and Kyle M. Shen and Brendan D. Faeth},
journal= {arXiv preprint arXiv:2303.07531},
year = {2023}
}