Studies on the Electronic Energy States of Germanium Microcrystal and the Chemical Shift due to Surface Oxidization by Means of Photoelectron Spectroscopy

1987 ◽  
Vol 26 (Part 1, No. 11) ◽  
pp. 1850-1854 ◽  
Author(s):  
Toshihiro Arai ◽  
Reiji Tagawa
Keyword(s):  
Chemical Shift ◽  
Photoelectron Spectroscopy ◽  
Electronic Energy ◽  
Energy States ◽  
Surface Oxidization

scholarly journals Xps Study of Ni-Fe Manganite Thermistor Material

1994 ◽  
Vol 360 ◽  
Author(s):  
D. N. Braski ◽  
N. R. Osborne ◽  
J. M. Zurbuchen
Keyword(s):  
Chemical Shift ◽  
Photoelectron Spectroscopy ◽  
Ionic Structure ◽  
Nickel Iron ◽  
Temperature Range ◽  
Tetrahedral Sites ◽  
Ionic Changes ◽  
Energy States ◽  
Xps Study ◽  
Thermistor Material

AbstractThe resistivity of the as-fabricated thermistor material, nickel-iron-manganite, changes during initial aging in the temperature range of 150-300ºC before becoming stable.X-ray photoelectron spectroscopy (XPS) was used to determine if any valency change or chemical shift of the cations or oxygen occurred during aging. The goal of the study was to identify any ionic changes that might affect thermistor stability. The only observed changes in 2p3/2 peaks due to aging were those related to Ni ions; the same peaks for Mn, Fe, and the 0-Is peak were unchanged. The changes in the Ni 2p3/2 peak may possibly be related to: (a) the migration of Ni2+ ions from octahedral to tetrahedral sites, (b) subtle changes in the energy states of Ni2+ which promoted a more stable ionic structure, or (c) the presence of Ni3+ ions, some of which revert to Ni2s+.

scholarly journals XPS Investigations on Solid and Vacuum Deposited, Oxidized and Non-oxidized Palladium

1995 ◽  
Vol 50 (4-5) ◽  
pp. 381-387 ◽  
Author(s):  
Jürgen Kintrup ◽  
Harald Züchner
Keyword(s):  
Chemical Shift ◽  
Curve Fitting ◽  
Photoelectron Spectroscopy ◽  
Chemical Shifts ◽  
Atmospheric Oxygen ◽  
Hydrogen Permeability ◽  
Photoelectric Effect ◽  
High Accuracy ◽  
X Ray ◽  
Charging Effect

Abstract X-ray photoelectron spectroscopy (XPS) has been carried out to study the reaction of differently prepared palladium samples (solid and film Pd) with atmospheric oxygen. A careful curve fitting of the measured Pd-3d5/2 peak allows to separate the Pd-3d5/2 peak for Pd in surface PdO from the dominant Pd-3d5/2 peak of the non-oxidized bulk palladium and to determine the chemical shift of the "oxidized" Pa line with high accuracy. Differences in the chemical shifts for the surface PdO on solid and film palladium are explained by a different charging caused by the photoelectric effect in XPS measurements. The smaller charging effect observed for film palladium as compared to solid palladium indicates a stronger oxygen bonding to the (rougher) film palladium. The strong Pd-O bonding seems to be an essential reason for the reduced hydrogen-permeability of film palladium compared to solid palladium

scholarly journals Following excited-state chemical shifts in molecular ultrafast x-ray photoelectron spectroscopy

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
D. Mayer ◽  
F. Lever ◽  
D. Picconi ◽  
J. Metje ◽  
S. Alisauskas ◽  
...  
Keyword(s):  
Excited State ◽  
Chemical Shift ◽  
Photoelectron Spectroscopy ◽  
Chemical Shifts ◽  
Excited Molecule ◽  
Charge Motion ◽  
Core Electron ◽  
Xps Spectra ◽  
X Ray ◽  
State Chemical

AbstractThe conversion of photon energy into other energetic forms in molecules is accompanied by charge moving on ultrafast timescales. We directly observe the charge motion at a specific site in an electronically excited molecule using time-resolved x-ray photoelectron spectroscopy (TR-XPS). We extend the concept of static chemical shift from conventional XPS by the excited-state chemical shift (ESCS), which is connected to the charge in the framework of a potential model. This allows us to invert TR-XPS spectra to the dynamic charge at a specific atom. We demonstrate the power of TR-XPS by using sulphur 2p-core-electron-emission probing to study the UV-excited dynamics of 2-thiouracil. The method allows us to discover that a major part of the population relaxes to the molecular ground state within 220–250 fs. In addition, a 250-fs oscillation, visible in the kinetic energy of the TR-XPS, reveals a coherent exchange of population among electronic states.

Electronic energy states in Si-doped MgO for exoelectron emission

2009 ◽  
Vol 106 (1) ◽  
pp. 014911 ◽  
Author(s):  
S. Ho ◽  
S. Nobuki ◽  
N. Uemura ◽  
S. Mori ◽  
T. Miyake ◽  
...  
Keyword(s):  
Electronic Energy ◽  
Exoelectron Emission ◽  
Si Doped ◽  
Energy States

HYDROGEN BONDING IN DIAMOND: A COMPUTATIONAL STUDY

2006 ◽  
Vol 17 (07) ◽  
pp. 959-966 ◽  
Author(s):  
O. OFER ◽  
JOAN ADLER ◽  
A. HOFFMAN
Keyword(s):  
Density Of States ◽  
Fermi Energy ◽  
Computational Study ◽  
Tight Binding ◽  
Local Deformation ◽  
Electronic Energy ◽  
Hydrogen Atoms ◽  
High Hydrogen ◽  
New Energy ◽  
Energy States

We present tight binding molecular dynamics simulations of the diffusion and bonding of hydrogen in bulk diamond. The motion of hydrogen atoms and the resultant structural and electronic energy level changes are investigated. The hydrogen atoms were found to have a tendency to migrate to the surface layer of diamond, resulting in a local deformation of the lattice, creating new energy states above and below the Fermi energy in the bandgap of the diamond density of states. In the diamond bulk, at high hydrogen concentrations, vacancies created by a hydrogen atom are quickly filled with other hydrogen atoms causing a deformation of the diamond lattice, inducing H 2 formation. This creates new energy states above the Fermi energy and reduces the secondary bandgap of the diamond density of states.

scholarly journals Chemical Shift of Cesium Compounds by X-ray Photoelectron Spectroscopy

Hyomen Kagaku ◽  
2013 ◽  
Vol 34 (3) ◽  
pp. 131-134 ◽  
Author(s):  
Tamao HATTA ◽  
Seiko NEMOTO ◽  
Yuzo MANPUKU ◽  
Naruo MATSUMOTO ◽  
Hirohisa YAMADA
Keyword(s):  
Chemical Shift ◽  
Photoelectron Spectroscopy ◽  
X Ray

Electronic Energy Levels of Organic Dyes on Silicon:  A Photoelectron Spectroscopy Study of ZnPc, F16ZnPc, and ZnTPP on p-Si(111):H

2004 ◽  
Vol 108 (50) ◽  
pp. 19398-19403 ◽  
Author(s):  
Ulrich Weiler ◽  
Thomas Mayer ◽  
Wolfram Jaegermann ◽  
Christian Kelting ◽  
Derck Schlettwein ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Organic Dyes ◽  
Energy Levels ◽  
Electronic Energy ◽  
Spectroscopy Study ◽  
Electronic Energy Levels
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