The slope-background for the near-peak regimen of photoemission spectra
The slope-background for the near-peak regimen of photoemission spectra
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DOI：
10.1016/j.elspec.2013.07.006
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发表时间：
2013-08-01
影响因子：
1.9
通讯作者：
Vazquez-Lepe, M. O.
中科院分区：
文献类型：
--
作者：
Herrera-Gomez, A.;Bravo-Sanchez, M.;Vazquez-Lepe, M. O.
光电发射数据通常显示峰两侧之间的背景强度的变化。雪莉-舍伍德的背景通常很好地再现了这一步。然而，在接近峰值的情况下，背景斜率的变化，尽管通常是存在的，但并不总是肉眼看起来那么明显。然而，与其斜率的演变相关的背景信号的强度可以被察觉到。坡度背景的设计是为了从经验上再现坡度上的变化。类似于非迭代雪莱方法，所提出的泛函形式将背景斜率与较高电子动能下的积分信号联系起来。根据Tougaard-Sigmund的电子输运理论，可以在近峰区预测这种形式。为了同时再现背景上的台阶和坡度变化，在活动背景方法下，有必要将坡度背景与Shirley-Sherwood背景相结合。如对一系列材料所示，斜率背景的应用提供了很好的拟合，对操作员来说是透明的，并且比其他背景方法更独立于拟合范围。通过结合斜率和Shirley-Sherwood背景评估的总面积大于仅使用Shirley-Sherwood背景时的面积，而小于使用Tougaard背景时的总面积。(C)2013爱思唯尔B.V.保留所有权利。
Photoemission data typically exhibits a change on the intensity of the background between the two sides of the peaks. This step is usually very well reproduced by the Shirley-Sherwood background. Yet, the change on the slope of the background in the near-peak regime, although usually present, is not always as obvious to the eye. However, the intensity of the background signal associated with the evolution of its slope can be appreciable. The slope-background is designed to empirically reproduce the change on the slope. Resembling the non-iterative Shirley method, the proposed functional form relates the slope of the background to the integrated signal at higher electron kinetic energies. This form can be predicted under Tougaard-Sigmund's electron transport theory in the near-peak regime. To reproduce both the step and slope changes on the background, it is necessary to employ the slope-background in conjunction with the Shirley-Sherwood background under the active-background method. As it is shown for a series of materials, the application of the slope-background provides excellent fits, is transparent to the operator, and is much more independent of the fitting range than other background methods. The total area assessed through the combination of the slope and the Shirley-Sherwood backgrounds is larger than when only the Shirley-Sherwood background is employed, and smaller than when the Tougaard background is employed. (C) 2013 Elsevier B.V. All rights reserved.