scholarly journals Ability in Surface Analysis of Soft X-ray XAFS taken with the Fluorescence Yield Mode —— Probing Depth and Self-Absorption Correction Method

2018 ◽  
Vol 25 (1) ◽  
pp. 37-38
Author(s):  
Noriaki Usuki ◽  
Akiko Ito ◽  
Takeharu Adadhi ◽  
Hiroko Hayamizu ◽  
Keisuke Yamanaka
Keyword(s):  
Surface Analysis ◽  
Correction Method ◽  
Fluorescence Yield ◽  
X Ray ◽  
Absorption Correction ◽  
Probing Depth ◽  
Yield Mode

A simple empirical absorption-correction method for X-ray intensity data films

1973 ◽  
Vol 29 (3) ◽  
pp. 291-295 ◽  
Author(s):  
P. Schwager ◽  
K. Bartels ◽  
R. Huber
Keyword(s):  
Correction Method ◽  
Intensity Data ◽  
X Ray ◽  
Absorption Correction ◽  
Empirical Absorption Correction

Probing depth of soft x-ray absorption spectroscopy measured in total-electron-yield mode

1992 ◽  
Vol 18 (1) ◽  
pp. 65-69 ◽  
Author(s):  
M. Abbate ◽  
J. B. Goedkoop ◽  
F. M. F. de Groot ◽  
M. Grioni ◽  
J. C. Fuggle ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Total Electron Yield ◽  
Total Electron ◽  
X Ray ◽  
Electron Yield ◽  
Probing Depth ◽  
X Ray Absorption ◽  
Yield Mode

scholarly journals High pressure effects on U L3x-ray absorption in partial fluorescence yield mode and single crystal x-ray diffraction in the heavy fermion compound UCd11

2016 ◽  
Vol 28 (10) ◽  
pp. 105601 ◽  
Author(s):  
Farzana Nasreen ◽  
Daniel Antonio ◽  
Derrick VanGennep ◽  
Corwin H Booth ◽  
Karunakar Kothapalli ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystal ◽  
Heavy Fermion ◽  
Fluorescence Yield ◽  
Pressure Effects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heavy Fermion Compound ◽  
High Pressure Effects ◽  
Yield Mode

Gaussian ϕ(ρz) curves: Comparison with other models

1990 ◽  
Vol 48 (2) ◽  
pp. 192-193
Author(s):  
Alberto Riveros ◽  
Gustavo Castellano
Keyword(s):  
Good Description ◽  
Bulk Sample ◽  
Incident Electron Energy ◽  
Power Mean ◽  
General Shape ◽  
Ionization Cross ◽  
X Ray ◽  
Mass Absorption ◽  
Absorption Correction ◽  
Image Position

X ray characteristic intensity Ii , emerging from element i in a bulk sample irradiated with an electron beam may be obtained throughwhere the function ϕi(ρz) is the distribution of ionizations for element i with the mass depth ρz, ψ is the take-off angle and μi the mass absorption coefficient to the radiation of element i.A number of models has been proposed for ϕ(ρz), involving several features concerning the interaction of electrons with matter, e.g. ionization cross section, stopping power, mean ionization potential, electron backscattering, mass absorption coefficients (MAC’s). Several expressions have been developed for these parameters, on which the accuracy of the correction procedures depends.A great number of experimental data and Monte Carlo simulations show that the general shape of ϕ(ρz) curves remains substantially the same when changing the incident electron energy or the sample material. These variables appear in the parameters involved in the expressions for ϕ(ρz). A good description of this function will produce an adequate combined atomic number and absorption correction.

point-Analysis Using the Extrapolation Method in the Analytical Electron microscope

1990 ◽  
Vol 48 (2) ◽  
pp. 430-431
Author(s):  
Zenji Horita ◽  
Ryuzo Nishimachi ◽  
Takeshi Sano ◽  
Minoru Nemoto
Keyword(s):  
Electron Microscope ◽  
Extrapolation Method ◽  
X Ray ◽  
Absorption Correction ◽  
Point Analysis ◽  
Analytical Electron ◽  
Analytical Electron Microscope ◽  
Data Points ◽  
Identical Composition ◽  
X Ray Absorption

Absorption correction is often required in quantitative x-ray microanalysis of thin specimens using the analytical electron microscope. For such correction, it is convenient to use the extrapolation method[l] because the thickness, density and mass absorption coefficient are not necessary in the method. The characteristic x-ray intensities measured for the analysis are only requirement for the absorption correction. However, to achieve extrapolation, it is imperative to obtain data points more than two at different thicknesses in the identical composition. Thus, the method encounters difficulty in analyzing a region equivalent to beam size or the specimen with uniform thickness. The purpose of this study is to modify the method so that extrapolation becomes feasible in such limited conditions. Applicability of the new form is examined by using a standard sample and then it is applied to quantification of phases in a Ni-Al-W ternary alloy.The earlier equation for the extrapolation method was formulated based on the facts that the magnitude of x-ray absorption increases with increasing thickness and that the intensity of a characteristic x-ray exhibiting negligible absorption in the specimen is used as a measure of thickness.

scholarly journals Chemical, electrochemical, thermodynamic and adsorption study of EN8 dual-phase steel with ferrite-martensite structure in 0.5 M H2SO4 using pectin as inhibitor

2021 ◽  
Author(s):  
P. R. Prabhu ◽  
Pavan Hiremath ◽  
Deepa Prabhu ◽  
M. C. Gowrishankar ◽  
B. M. Gurumurthy
Keyword(s):  
Weight Loss ◽  
Adsorption Isotherm ◽  
Surface Analysis ◽  
Potentiodynamic Polarization ◽  
Dual Phase Steel ◽  
Inhibition Efficiency ◽  
Dual Phase ◽  
X Ray ◽  
Enthalpy And Entropy ◽  
Martensite Structure

AbstractThis paper presents the corrosion and inhibition behavior of heat-treated EN8 dual-phase steel with ferrite-martensite structure with pectin in 0.5 M sulphuric acid. The corrosion studies were performed using the weight loss method, electrochemical techniques such as potentiodynamic polarization measurements, and impedance spectroscopy. The study was done at different concentrations of pectin in the temperature range of 40 to 70 °C and immersion time of 1, 3, 5, and 7 h. The results showed that the inhibition performance of pectin has enhanced with an increase in pectin concentration and decreased with the temperature and time of exposure. From the weight loss study, highest inhibition efficiency of 76.43% was achieved at 5.0 g/L at 1 h of exposure at 40 °C. The maximum inhibition efficiency of 62% was obtained with 5.0 g/L of pectin at 40 °C by potentiodynamic polarization method. The energy, enthalpy, and entropy of activation and also thermodynamic parameters like free energy, enthalpy, and entropy of adsorption were assessed and discussed. Appropriate adsorption isotherm was fit to the obtained experimental outcomes and achieved Langmuir adsorption isotherm to be the best fit and obeyed physical adsorption. Surface analysis: scanning electron microscopy, X-ray diffraction techniques, atomic force microscopy, and energy dispersive X-ray were done with and without the addition of pectin. The metal surface appears to be uniform and smooth in the presence of pectin and adsorption was confirmed by surface analysis.

The calculation of mylar film absorption correction coefficients in X-ray spectrochemical analysis of aqueous samples

1977 ◽  
Vol 6 (4) ◽  
pp. 212-214 ◽  
Author(s):  
J. G. Dick ◽  
C. C. Wan ◽  
R. Difruscia
Keyword(s):  
Spectrochemical Analysis ◽  
Aqueous Samples ◽  
X Ray ◽  
Absorption Correction ◽  
Film Absorption
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