清洁表面和被吸附物覆盖的表面正电子湮灭产生的伽马辐射的多普勒加宽能谱的测量和分析

IF 6.9 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
S. Lotfimarangloo , H. Mahdy , P. Sau , P.A. Sterne , R.W. Gladen , J. Driscoll , M. Rooks , M. Chrysler , A.R. Koymen , J. Asaadi , V.A. Chirayath , A.H. Weiss
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引用次数: 0

摘要

我们提出了测量和理论模型,证明了巧合多普勒加宽(CDB)湮灭伽马能谱能够从表面最顶层的原子层提供元素特定信息。我们的测量表明,在金(Au),银(Ag)和铜(Cu)的清洁和吸附表面的最上层原子层中,正电子湮灭后发射的多普勒位移湮灭伽马光子的能谱有显著差异。利用比值曲线分析的多普勒加宽伽玛谱的形状表明,尽管正电子湮灭和核心电子湮灭显著减少,表面的元素组成仍然可以被识别。我们利用计算比率曲线的线性组合,将测量的多普勒光谱与清洁铜表面的多普勒光谱的比值进行建模,从而估计各种探测表面的化学成分。通过对实验比例曲线的拟合,获得了含硫偏析、氧吸附、薄膜硒(Se)和单层石墨烯(SLG)的Cu表面元素组成的估计。对环境吸附后的Ag表面、氩离子溅射后的Ag表面以及溅射后的Au表面进行了类似的分析。用CDB数据分析得到的表面成分与用正电子湮灭诱导俄歇电子能谱(PAES)得到的表面成分进行了比较。我们的研究结果表明,CDB可以检测、识别和量化沉积在金属基底上的亚单层吸附物和单原子层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Measurement and analysis of the Doppler broadened energy spectra of gamma radiation originating from the annihilation of positrons incident on clean and adsorbate-covered surfaces

Measurement and analysis of the Doppler broadened energy spectra of gamma radiation originating from the annihilation of positrons incident on clean and adsorbate-covered surfaces

Measurement and analysis of the Doppler broadened energy spectra of gamma radiation originating from the annihilation of positrons incident on clean and adsorbate-covered surfaces
We present measurements and theoretical modeling demonstrating the capability of coincidence Doppler broadened (CDB) annihilation gamma spectroscopy to provide element-specific information from the topmost atomic layer of surfaces. Our measurements show that the energy spectra of Doppler-shifted annihilation gamma photons emitted following the annihilation of positrons from the topmost atomic layers of clean and adsorbate covered surfaces of gold (Au), silver (Ag) and copper (Cu) differ significantly. The shape of the Doppler-broadened gamma spectrum, as analyzed using ratio curves, indicates that the elemental composition of the surface can still be identified despite contributions from positronium annihilation and a significant reduction in core electron annihilation. We estimate the chemical composition of the various probed surfaces by modeling the ratios of the measured Doppler spectra with respect to the Doppler spectra from a clean Cu surface using a linear combination of calculated ratio curves. The fitting of the experimental ratio curves was used to obtain an estimate of the elemental composition of Cu surfaces with sulfur segregation, oxygen adsorption, a thin film of Selenium (Se), and a single layer of graphene (SLG). A similar analysis was performed on the Ag surface with environmental adsorbates, the same surface after argon ion sputtering, as well as a sputter cleaned Au surface. The surface compositions obtained from the analysis of the CDB data were compared to the compositions obtained using positron annihilation induced Auger electron spectroscopy (PAES). Our results show that CDB can detect, identify, and quantify, sub-monolayer adsorbates and a single atomic layer deposited on metal substrates.
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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