Thickness effect on the extended-x-ray-absorption-fine-structure amplitude

Stern, Edward A.; Kim, K.

doi:10.1103/physrevb.23.3781

Cited by 276 publications

(126 citation statements)

References 14 publications

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“…Typically, the sample thickness d should be optimized to assure the edge jump Δμd ≈ 1, where Δμ is the difference of the absorption coefficient before and after the absorption edge. If this is satisfied, the "thickness effects" [38] could be avoided and the data could have a good signal/noise ratio. This requires that the grain sizes for powder samples should be smaller than or comparable to the absorption length of the material.…”

Section: Transmission Modementioning

confidence: 99%

X-ray absorption fine structure spectroscopy in nanomaterials

et al. 2015

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X-ray absorption fine structure (XAFS) spectroscopy has been widely used for decades in a wide range of scientific fields, including physics, chemistry, biology, materials sciences, environmental sciences, etc. This review article is devoted to the applications of XAFS in nanomaterials. The basic principles of XAFS are briefly described from the view point of practical application, including its theory, data analysis and experiments. Using selected examples from recent literatures, the power of XAFS in determination of local atomic/electronic structures is illustrated for various nanomaterials, covering metal and semiconductor nanoparticles, catalysts, core/shell structures, ultrathin nanosheets, and so on. The utilization of time-resolved XAFS technique is also briefly introduced, for in-situ probing the nucleation/growth processes of nanomaterials and identifying reaction intermediates of nanostructured catalysts under operando conditions.

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Section: Transmission Modementioning

confidence: 99%

X-ray absorption fine structure spectroscopy in nanomaterials

et al. 2015

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“…XAS measurements have been carried out on Se, Mn, Fe K edges. In the experiment the "thickness effect" was negligible [2]. The samples used had the surface density from about 1.5 to 7.0 mg/cm 2 .…”

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confidence: 99%

The XANES K-Edge Spectra for HgMnSe and HgFeSe

et al. 1991

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X-ray absorption near-edge structure for Hg1-xMnxSe and Hg1-xFexSe was studied with the use of synchrotron radiation. The self-consistent, semirelativistic LMTO method within the LD approximation was used to calculate electronic band structure and K-edge spectra of these semimagnetic semiconductors. The theoretical results for X-ray absorption spectra were compared with experimental data.PACS numbers: 78.70.Dm XANES measurements have been carried out with the use of synchrotron radiation at the ADONE WIGGLER facility in Frascati [1] utilizing the Si(111) and Si(220) channel-cut crystal monochromators. The original samples were high purity Hg1 -x Mnx Se (x = 0.2) and Hg1-xFexSe (x = 0.1) monocrystals grown by Bridgman method. In order to obtain thin specimens of the controlled thickness and homogeneity as required by X-ray absorption technique the samples were finely powdered and deposited on polyacetate films. XAS measurements have been carried out on Se, Mn, Fe K edges. In the experiment the "thickness effect" was negligible [2]. The samples used had the surface density from about 1.5 to 7.0 mg/cm 2 .

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“…X-ray absorption spectroscopy measurements have been carried out for Se K edge. In the experiment the "thickness effect" was negligible [24].…”

Section: Experiments and Resultsmentioning

confidence: 85%

X-Ray Absorption Near Edge Structure Analysis of HgMnSe, HgFeSe and HgTeSe

et al. 1993

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Experimental studies of the Se K X-ray absorption edges have been carried out in HgTe0.5Se0.5, Hg0.8 Mn0 .2 Se and Hg0.9Fe0.1Se. A comparison is made for Hg0.5Mn0.5Se and Hg0,5 Fe0,5 Se theoretical results obtained by the self-consistent, semi-relativistic LMTO method within the LD approximation. Small differences of Se K edge XANES have been shown for HgTeSe and HgSe in contrary to evident differences for HgMnSe and HgFeSe. This behaviour of the absorption Se K edges is related to significant, hybridized contribution of the 3d and 4s Mn or Fe unoccupied states. The maximal contributions of the hybridized bands of the hypothetic zinc-blende MnSe or FeSe were estimated using the virtual crystal modeł. These maximal contributions are situated at about 6 eV and 17 eV in zinc-blende MnSe and at -0.8 eV and 5.5 eV in zinc-blende FeSe. For HgFeSe apart from the evidence of the strongly localized resonant donor (empty for low Fe concentrations) the complementary hybridized contribution of Fe 3d empty states also situated around the conduction band minimum should be taken into consideration.

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Thickness effect on the extended-x-ray-absorption-fine-structure amplitude

Cited by 276 publications

References 14 publications

X-ray absorption fine structure spectroscopy in nanomaterials

X-ray absorption fine structure spectroscopy in nanomaterials

The XANES K-Edge Spectra for HgMnSe and HgFeSe

X-Ray Absorption Near Edge Structure Analysis of HgMnSe, HgFeSe and HgTeSe

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