The Effect of Adsorbeb Oxygen Ions on the Inelastic Scattering of Photo-Electrons at the Metal-Vacuum Interface

1984 ◽  
Vol 41 ◽  
Author(s):  
W. Pong ◽  
D. Brandt ◽  
Z. X. He ◽  
W. Imaino
Keyword(s):  
Inelastic Scattering ◽  
Energy Levels ◽  
Film Deposition ◽  
Photoelectron Spectra ◽  
Aluminum Films ◽  
Vacuum Level ◽  
Oxygen Ions ◽  
Resonant States ◽  
Initial Stage ◽  
Vacuum Interface

AbstractMeasurements of uv photoemission from evaporated aluminum films were made at photon energies 7.7–11 eV as a function of time after film deposition. Evidence of the initial stage of chemisorption of oxygen can be seen in the uv photoelectron spectra. The spectra taken immediately after film deposition showed a smooth energy distribution characteristic of clean aluminum. Structure in the spectra was found to appear at approximately 60 minutes after deposition at 10−9 Torr. Three noticeable features were observed at 1.0, 1.3, and 2.5 eV above the vacuum level. They appeared stationary with increasing photon energy. The structure can be attributed to inelastic scattering of photoelectrons into resonant states associated with oxygen ions on the metal surface. The energy levels of the calculated resonant states of a helium-like system are compared with the energy of the observed structure. The agreement suggests that there are adsorbed 0− ions to which photoelectrons can be scattered at the metal-vacuum interface.

Poly(3-hexylthiophene) revisited – Influence of film deposition on the electrochemical behaviour and energy levels

2018 ◽  
Vol 269 ◽  
pp. 299-311 ◽  
Author(s):  
Kirsten Bruchlos ◽  
Daniel Trefz ◽  
Amer Hamidi-Sakr ◽  
Martin Brinkmann ◽  
Jürgen Heinze ◽  
...  
Keyword(s):  
Electrochemical Behaviour ◽  
Energy Levels ◽  
Film Deposition

Experimental and theoretical study of line shapes in 13C(α, α′) inelastic scattering to resonant states

1980 ◽  
Vol 343 ◽  
pp. 133-147 ◽  
Author(s):  
H. Fuchs ◽  
J.A. Nolen ◽  
G.J. Wagner ◽  
H. Lenske ◽  
G. Baur
Keyword(s):  
Inelastic Scattering ◽  
Theoretical Study ◽  
Line Shapes ◽  
Resonant States

Effects of Surface Roughness and Oxide Layer on the Thermal Boundary Conductance at Aluminum/Silicon Interfaces

2010 ◽  
Author(s):  
Patrick E. Hopkins ◽  
Leslie M. Phinney ◽  
Justin R. Serrano ◽  
Thomas E. Beechem
Keyword(s):  
Surface Roughness ◽  
Oxide Layer ◽  
Boundary Resistance ◽  
Film Deposition ◽  
Native Oxide ◽  
Thermal Boundary Resistance ◽  
Native Oxide Layer ◽  
Aluminum Films ◽  
Thermal Boundary Conductance ◽  
Material Length

Thermal boundary resistance dominates the thermal resistance in nanosystems since material length scales are comparable to material mean free paths. The primary scattering mechanism in nanosystems is interface scattering, and the structure and composition around these interfaces can affect scattering rates and, therefore, device thermal resistances. In this work, the thermal boundary conductance (the inverse of the thermal boundary resistance) is measured using a pump-probe thermoreflectance technique on aluminum films grown on silicon substrates that are subjected to various pre-Al-deposition surface treatments. The Si surfaces are characterized with Atomic Force Microscopy (AFM) to determine mean surface roughness. The measured thermal boundary conductance decreases as Si surface roughness increases. In addition, stripping the native oxide layer on the surface of the Si substrate immediately prior to Al film deposition causes the thermal boundary conductance to increase. The measured data are then compared to an extension of the diffuse mismatch model that accounts for interfacial mixing and structure around the interface.

High-Energy Levels in 13N

1973 ◽  
Vol 51 (11) ◽  
pp. 1227-1237 ◽  
Author(s):  
D. F. Measday ◽  
M. Hasinoff ◽  
D. L. Johnson
Keyword(s):  
Inelastic Scattering ◽  
Energy Range ◽  
Energy Levels ◽  
High Energy ◽  
Beam Direction ◽  
Excitation Functions ◽  
Carbon Target ◽  
Γ Rays ◽  
Natural Carbon

A natural carbon target was bombarded by protons in the energy range Ep = 9 to 24 MeV (Ex = 10 to 24 MeV in 13N). High-energy γ rays were detected in a NaI crystal oriented at 90° to the beam direction. Excitation functions were obtained for the 12.71 and 15.11 MeV γ rays from inelastic scattering on 12C and for capture γ rays from the reaction 12C(p, γo)13N. New structure is reported for all these reactions.

Photoelectron Spectroscopy of Heterocycles. Fluorene Analogues

1978 ◽  
Vol 33 (9) ◽  
pp. 1006-1012 ◽  
Author(s):  
B. Ruščić ◽  
B. Kovač ◽  
L. Klasinc ◽  
H. Güsten
Keyword(s):  
Linear Correlation ◽  
Photoelectron Spectroscopy ◽  
Energy Levels ◽  
Photoelectron Spectra ◽  
Orbital Interaction ◽  
Ionization Energies

The He(I) photoelectron spectra of fluorene and its analogues, biphenyl, dibenzofuran, carbazole, dibenzothiophene, and phenanthrene were measured and analyzed. The assignment of the π-electron ionizations using orbital interaction and symmetry arguments for the constituent parts of the molecules indicates that the energy levels of the fluorene analogues can be reproduced within a few percent of error. A close linear correlation between the π-ionization energies and the eigenvalues of the corresponding HMO-orbitals is obtained as well.

scholarly journals Deformed shell model study of event rates for WIMP-73Ge scattering

2017 ◽  
Vol 32 (38) ◽  
pp. 1750210 ◽  
Author(s):  
R. Sahu ◽  
V. K. B. Kota
Keyword(s):  
Dark Matter ◽  
Inelastic Scattering ◽  
Shell Model ◽  
Energy Levels ◽  
Supersymmetric Model ◽  
Dark Matter Candidate ◽  
Detection Rates ◽  
Hartree Fock ◽  
Model Study ◽  
Event Rates

The event detection rates for the Weakly Interacting Massive Particles (WIMP) (a dark matter candidate) are calculated with [Formula: see text]Ge as the detector. The calculations are performed within the deformed shell model (DSM) based on Hartree–Fock states. First, the energy levels and magnetic moment for the ground state and two low-lying positive parity states for this nucleus are calculated and compared with experiment. The agreement is quite satisfactory. Then the nuclear wave functions are used to investigate the elastic and inelastic scattering of WIMP from [Formula: see text]Ge; inelastic scattering, especially for the [Formula: see text] transition, is studied for the first time. The nuclear structure factors which are independent of supersymmetric model are also calculated as a function of WIMP mass. The event rates are calculated for a given set of nucleonic current parameters. The calculation shows that [Formula: see text]Ge is a good detector for detecting dark matter.

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