scholarly journals Sample-morphology effects on x-ray photoelectron peak intensities

2013 ◽  
Vol 31 (2) ◽  
pp. 021402 ◽  
Author(s):  
Cedric J. Powell ◽  
Sven Tougaard ◽  
Wolfgang S. M. Werner ◽  
Werner Smekal
Keyword(s):  
X Ray ◽  
Photoelectron Peak

scholarly journals in Situ X-ray Photoelectron Spectroscopic and Electrochemical Studies of the Bromide Anions Dissolved in 1-Ethyl-3-Methyl Imidazolium Tetrafluoroborate

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 304 ◽  
Author(s):  
Jaanus Kruusma ◽  
Arvo Tõnisoo ◽  
Rainer Pärna ◽  
Ergo Nõmmiste ◽  
Enn Lust
Keyword(s):  
Photoelectron Spectroscopy ◽  
Mesoporous Carbon ◽  
Residual Water ◽  
Carbon Electrode ◽  
Xps Spectra ◽  
X Ray ◽  
In Situ Xps ◽  
Vacuum Interface ◽  
Photoelectron Peak

Influence of electrode potential on the electrochemical behavior of a 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF4) solution containing 5 wt % 1-ethyl-3-methylimidazolium bromide (EMImBr) has been investigated using electrochemical and synchrotron-initiated high-resolution in situ X-ray photoelectron spectroscopy (XPS) methods. Observation of the Br 3d5/2 in situ XPS signal, collected in a 5 wt % EMImBr solution at an EMImBF4–vacuum interface, enabled the detection of the start of the electrooxidation process of the Br- anion to Br3- anion and thereafter to the Br2 at the micro-mesoporous carbon electrode, polarized continuously at the high fixed positive potentials. A new photoelectron peak, corresponding to B–O bond formation in the B 1s in situ XPS spectra at E ≤ –1.17 V, parallel to the start of the electroreduction of the residual water at the micro-mesoporous carbon electrode, was observed and is discussed. The electroreduction of the residual water caused a reduction in the absolute value of binding energy vs. potential plot slope twice to ca. dBE dE-1 = –0.5 eV V-1 at E ≤ –1.17 V for C 1s, N 1s, B 1s, F 1s, and Br 3d5/2 photoelectrons.

scholarly journals Predicting X-ray Photoelectron Peak Shapes: the Effect of Electronic Structure

2021 ◽  
Author(s):  
Christopher R. O’Connor ◽  
Matthijs A. van Spronsen ◽  
Mustafa Karatok ◽  
Jorge Boscoboinik ◽  
Cynthia M. Friend ◽  
...  
Keyword(s):  
Electronic Structure ◽  
X Ray ◽  
Photoelectron Peak

Surface chemical states of barium titanate: Influence of sample processing

1995 ◽  
Vol 10 (6) ◽  
pp. 1502-1507 ◽  
Author(s):  
Sharmila M. Mukhopadhyay ◽  
Tim C.S. Chen
Keyword(s):  
Photoelectron Spectroscopy ◽  
Chemical Reduction ◽  
Surface Region ◽  
Annealing Atmosphere ◽  
Near Surface ◽  
X Ray ◽  
Reducing Atmosphere ◽  
Special Surface ◽  
Chemical States ◽  
Photoelectron Peak

The composition and chemistry of the near-surface region of BaTiO3 have been studied using x-ray photoelectron spectroscopy (XPS). It is found that the Ba3d photoclectron peak shows two chemical states, one of which is attributed to the bulk perovskite and the other to a special surface state unrelated to contamination. The bulk component is reduced and the surface component increases when the material is annealed at high temperatures (either in reducing or oxidizing atmosphere). Both the components are unaltered if the sample is exposed to air, solvents, or water: processes that lead to adsorption of impurities. The surface peak, therefore, attributed to a relaxation related and not contamination-related state, has been compared with those in other Ba-containing oxides. The oxygen photoelectron peak consists of a normal perovskite peak typical of most titanates and a higher energy component clearly related to surface contamination. Annealing in reducing atmosphere results in drastically different optical and electrical properties, and in chemical reduction of some Ti4+ ions to Ti3+. The overall stoichiometry, however, does not change with annealing atmosphere. These results have been discussed in light of our current understanding of this and other related oxides.

Angular-dependent x-ray-photoelectron peak intensities from single-crystal gold

1977 ◽  
Vol 15 (2) ◽  
pp. 666-671 ◽  
Author(s):  
R. J. Baird ◽  
C. S. Fadley ◽  
L. F. Wagner
Keyword(s):  
Single Crystal ◽  
X Ray ◽  
Photoelectron Peak

Shifted x‐ray photoelectron peak in molecular beam epitaxial GaAs grown at 200 °C

1992 ◽  
Vol 61 (11) ◽  
pp. 1329-1331 ◽  
Author(s):  
D. C. Look ◽  
J. T. Grant ◽  
J. R. Sizelove
Keyword(s):  
Molecular Beam ◽  
X Ray ◽  
Epitaxial Gaas ◽  
Molecular Beam Epitaxial ◽  
Photoelectron Peak

THE GAS MONITORING OF THE BESIII DRIFT CHAMBER

2010 ◽  
Vol 25 (02) ◽  
pp. 143-150
Author(s):  
XIANGGAO WANG ◽  
CHANG CHEN ◽  
YUANBO CHEN ◽  
ZHI WU ◽  
YUNTING GU ◽  
...  
Keyword(s):  
Drift Chamber ◽  
Peak Position ◽  
Detector System ◽  
Gas Monitoring ◽  
X Ray ◽  
Full Energy ◽  
Monitoring Parameter ◽  
Gas System ◽  
Gas Detector ◽  
Photoelectron Peak

Two monitoring proportional counters (MPCs), installed at the inlet and outlet of the gas system of BESIII drift chamber (DC), were used to monitor the operation of the BESIII DC successfully and effectively as reported in this paper. The ratio of G out /G in (full energy photoelectron peak position of 55 Fe 5.9 keV X-ray in inlet MPC as Gin and outlet MPC as Gout ) is used as the main monitoring parameter. The MPC method is very useful for the gas detector system.

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Some Problems in Understanding the Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel
Keyword(s):  
Solar Corona ◽  
Solar Atmosphere ◽  
Theoretical Modelling ◽  
Total System ◽  
Major Advance ◽  
X Ray ◽  
Proper Perspective ◽  
Space Observations

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.

Sign in / Sign up

Export Citation Format

Share Document