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arXiv · 2303.07531

An Algorithm for Subtraction of Doublet Emission Lines in Angle-Resolved Photoemission Spectroscopy

Yaoju Tarn·Mekhola Sinha·Christopher Pasco·Darrell G. Schlom·Tyrel M. McQueen·Kyle M. Shen·Brendan D. Faeth
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Abstract

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-I$α$ spectra in a physically sound manner that reliably reproduces quantifiable dispersion relations and quasiparticle lifetimes.

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Yaoju Tarn, Mekhola Sinha, Christopher Pasco, Darrell G. Schlom, Tyrel M. McQueen, Kyle M. Shen, Brendan D. Faeth. 2023-03-13. An Algorithm for Subtraction of Doublet Emission Lines in Angle-Resolved Photoemission Spectroscopy. https://arxiv.org/abs/2303.07531

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