Evaluation of correction accuracy of several schemes for AES matrix effect corrections

Tanuma, Shigeo; Sekine, T.; Yoshihara, Kazuhiro; Shimizu, Ryuichi; Homma, Teiichi; Tokutaka, Heizō; Goto, Keisuké; Uemura, M.; Fujita, Daisuke; Kurokawa, Atsushi; Ichimura, Shingo; Oshima, Chieko; Kurahashi, Mitsunori; Kudo, M.; Hashiguchi, Yoshihiro; Suzuki, Teruo; Ohmura, Takuichi; Soeda, Fusami; Tanaka, Koji; Tanaka, Akihiro; Shiokawa, Yoshinobu; Hayashi, T.

doi:10.1002/sia.740150805

Cited by 20 publications

(2 citation statements)

References 22 publications

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“…This is in agreement with the VAMAS study conducted on this system, 12 and mainly due to the fact that the two metals are located far away from each other in the periodic table. This affects strongly the density, the backscattering factor, and the inelastic mean free path.…”

Section: Segregation Resultssupporting

confidence: 90%

Surface composition of CuAu single crystal electrodes determined by a coupled UHV–electrochemical approach and a Monte‐Carlo simulation

Pace

Hoof

Hou

et al. 2004

Surface & Interface Analysis

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Recent papers show that copper could act as an electrode capable of electrocatalysing the reduction of carbon dioxide, a major greenhouse gas. However, no fundamental studies on single crystals have been related, and although the presence of surface oxides seems to be important, little is known about the mechanism.Single crystal electrodes of Au, Cu and AuCu alloys (1, 10, and 20 at.% gold) and a 50 at.% gold polycrystal alloy have been synthesized and characterized by AES and cyclic voltammetry (CV). The segregation equilibrium was studied experimentally (using the low-energy Auger peaks of Cu and Au after deconvolution) and theoretically (with classical thermodynamics and a Monte-Carlo Metropolis approach). All the alloy electrodes show a surface enrichment in gold. The electrochemical characterization reveals that the dilution of copper by gold delays the oxidation of the electrode to more positive potentials with respect to pure copper, whereas simultaneously the reduction of protons occurs at more negative potentials than pure gold. Thanks to an electrochemical-UHV transfer system, we show that the surface composition of the electrode drastically depends on the working potential.

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Section: Segregation Resultssupporting

confidence: 90%

Surface composition of CuAu single crystal electrodes determined by a coupled UHV–electrochemical approach and a Monte‐Carlo simulation

Pace

Hoof

Hou

et al. 2004

Surface & Interface Analysis

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“…This functions have also been proposed as functions of mean atomic number and overvoltage ratio (U D E/E b , where E b is the binding energy). 1,5 In a similar to Au and Cu, the polynomial approximation function of Si and N is expressed as Eqn (3) …”

Section: Application To Quantitative Analysis Of Insulator Sample (Simentioning

confidence: 99%

Backscattering correction for AES spectra measured at oblique (>45°) incidence of primary electron beam

Shimotsuma

Ichimura²

2001

Surface & Interface Analysis

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The validity of matrix corrections on an AES analysis for incident angles q (measured from the surface normal) of >45• was examined. The correction factors to take into account were the atomic density correction factor (N), the electron backscattering correction factor (R) and the inelastic mean free path (l). The backscattering correction factor at large incidence angles was estimated by extrapolation from the factors for q < 45• , which have been reported based on Monte-Carlo simulations. The validity of the extrapolation was checked using pure Au and Cu samples used in the measurements of AES intensity dependence on the angle of incidence. This present approach then was applied to the quantitative analysis of Si 3 N 4 samples for a large incident angles. It was confirmed that the proposed matrix correction method is more accurate than the conventional one based on the use of sensitivity factors.

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Spectrum Synthesis Based on Non-linear Addition

Bakush

Gomati

1996

Surf. Interface Anal.

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One of the proposed approaches in the literature for quantitative analysis in AES is the linear addition of elementalspectra acquired in the direct energy mode (N(E) vs.E andE·N(E) vs.E). Quantification is then achieved by matching the shape of the added spectra to that of an unknown that was also collected under identical experimental conditions. However, it is shown here that the linear combination of elemental spectra employed in this approach has no real justification in theory. Any agreement with experiment found using this approach can therefore be of doubtful value. To avoid uncertainty, non‐linear addition formulae that take the matrix effects (of the substrate) into consideration are developed. Results obtained with these formulae on AuCu alloys are described. The observed success of the linear addition is explained in terms of more rigorous non‐linear addition.

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Evaluation of correction accuracy of several schemes for AES matrix effect corrections

Cited by 20 publications

References 22 publications

Surface composition of CuAu single crystal electrodes determined by a coupled UHV–electrochemical approach and a Monte‐Carlo simulation

Surface composition of CuAu single crystal electrodes determined by a coupled UHV–electrochemical approach and a Monte‐Carlo simulation

Backscattering correction for AES spectra measured at oblique (>45°) incidence of primary electron beam

Spectrum Synthesis Based on Non-linear Addition

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