An algorithm for subtraction of doublet emission lines in angle-resolved photoemission spectroscopy

• Published in: Journal of electron spectroscopy and related phenomena 2023-05, Vol.265, p.147323, Article 147323
• Main Authors: Tarn, Yaoju, Sinha, Mekhola, Pasco, Christopher, Schlom, Darrell G., McQueen, Tyrel M., Shen, Kyle M., Faeth, Brendan D.
• Format: Article
• Language: English
• Subjects: ARPES; Methods; Photoemission spectroscopy; Plasma discharge sources
• ISSN: 0368-2048; 1873-2526
• DOI: 10.1016/j.elspec.2023.147323

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. •Simple method to remove superimposed doublets from photoemission spectra.•Unlocks new energies for lab-based angle-resolved photoemission spectroscopy.•Recovers dispersion relations and lifetimes obtained from monochromatic source.•Universal and bypasses need for specific vacuum ultraviolet filters at no expense.