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

IF 1.8 4区物理与天体物理 Q2 SPECTROSCOPY Journal of Electron Spectroscopy and Related Phenomena Pub Date : 2023-05-01 DOI:10.1016/j.elspec.2023.147323

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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角分辨光发射光谱中双重发射线的减法算法

等离子体放电灯作为窄线宽紫外光子源广泛应用于角分辨光谱学(ARPES)实验。然而，许多发射谱线如Ar-I, Ne-I和Ne-II具有紧密间隔的重线发射谱线，这导致了ARPES测量光谱的叠加复制。在这里，我们提出了一种简单的方法，从光发射光谱中减去这些双重发射线的贡献。通过对表征良好的二维材料的ARPES光谱进行基准测试，我们证明了该算法能够以物理合理的方式减去重态信号并再现单色化he - i - α光谱的关键特征，从而可靠地再现可量化的色散关系和准粒子寿命。

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来源期刊

Journal of Electron Spectroscopy and Related Phenomena 物理-光谱学

CiteScore

3.30

自引率

5.30%

发文量

审稿时长

60 days

期刊介绍： The Journal of Electron Spectroscopy and Related Phenomena publishes experimental, theoretical and applied work in the field of electron spectroscopy and electronic structure, involving techniques which use high energy photons (>10 eV) or electrons as probes or detected particles in the investigation.