Compton Scattering from Heavier Metals

1993 ◽  
Vol 48 (1-2) ◽  
pp. 334-342 ◽  
Author(s):  
B. K Sharma
Keyword(s):  
Electronic Structure ◽  
Compton Scattering ◽  
Three Dimensional ◽  
Ion Beams ◽  
Compton Profile ◽  
Good Resolution ◽  
Dimensional Electron ◽  
Electron Momentum ◽  
Momentum Distributions

Abstract The use of Compton scattering in the determination of electronic structure has grown considerably in the last two decades. With the advent of synchrotron radiation it has become possible, even with good resolution, to measure several single-crystal orientations to determine three-dimensional electron momentum distributions. Although most of the earlier work has been directed to low-Z materials, in the last few years medium and high-Z metals have also been investigated with this technique. In this paper we present a review of these studies on heavier metals with particular attention to the difficulties encountered. Compton profile measurements from techniques based on energetic ion beams are also considered briefly.

Reconstructed three-dimensional electron momentum density in lithium: A Compton scattering study

2001 ◽  
Vol 63 (4) ◽  
Author(s):  
Yoshikazu Tanaka ◽  
Y. Sakurai ◽  
A. T. Stewart ◽  
N. Shiotani ◽  
P. E. Mijnarends ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Three Dimensional ◽  
Momentum Density ◽  
Dimensional Electron ◽  
Electron Momentum ◽  
Electron Momentum Density ◽  
Scattering Study

scholarly journals Spin-resolved momentum densities: probing orbitals in magnetic oxides

2014 ◽  
Vol 70 (a1) ◽  
pp. C1554-C1554
Author(s):  
Jonathan Duffy
Keyword(s):  
Electronic Structure ◽  
Compton Scattering ◽  
Molecular Orbital ◽  
Electronic Structure Calculations ◽  
High Energy ◽  
Compton Profile ◽  
Spin Moment ◽  
Orbital Moment ◽  
Electron Momentum ◽  
Structure Calculations

Studies of spin-resolved electron momentum densities involve the measurement of the so-called magnetic Compton profile. This is a one-dimensional projection of the electron momentum distribution of only those electrons that contribute to the spin moment of a sample. The technique is applicable to ferri- and ferromagnetic materials. Since electrons originating from different atomic orbitals have specific momentum densities, it is often possible to determine the origin of the magnetism present. Typically, interpretation requires the use of electronic structure calculations using molecular orbital and band structure approaches. The profile is obtained experimentally via the inelastic "Compton" scattering of high energy X-rays. For the experiments discussed here, the high energy beamlines at the ESRF and SPring-8 synchrotron X-ray sources were used, where we have a cryomagnet which can provide a sample environment with applied magnetic fields up to 9 Tesla, at temperatures from 1.3K to 600K. In this talk, we discuss our combined experimental and theoretical study of the spin density of the low-dimensional frustrated metamagnet Ca3Co2O6. The spin moment, measured using magnetic Compton scattering, confirms the existence of a large unquenched Co orbital moment (1.310.1 μB). With regards to the orbital occupation, we have performed molecular orbital calculations on the active trigonal CoO6cluster in order to determine which Co 3d orbitals are responsible for the observed electronic and magnetic behaviour and the observed orbital moment, and revealing the existence a oxygen spin moment of approximately 0.9 μB. Electronic structure calculations with a Hubbard U energy term give Compton profiles which are in good agreement with our experimental data. The magnetic Compton profile exhibits oscillations, which are well described, and their frequency in momentum space corresponds to the real-space inter-cobalt site bond length.

scholarly journals Electron Compton scattering and the measurement of electron momentum distributions in solids

2020 ◽  
Vol 279 (3) ◽  
pp. 185-188 ◽  
Author(s):  
A. TALMANTAITE ◽  
M.R.C. HUNT ◽  
B.G. MENDIS
Keyword(s):  
Compton Scattering ◽  
Electron Momentum ◽  
Momentum Distributions

Three-dimensional electron momentum densities:A comparison of (γ,eγ) and (e,2e) spectroscopies

1997 ◽  
Vol 55 (8) ◽  
pp. 5440-5447 ◽  
Author(s):  
F. F. Kurp ◽  
M. Vos ◽  
Th. Tschentscher ◽  
A. S. Kheifets ◽  
J. R. Schneider ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Dimensional Electron ◽  
Electron Momentum

scholarly journals Two-dimensional electron-momentum densities from angular-correlation measurements of Compton scattering

1993 ◽  
Vol 48 (23) ◽  
pp. 16965-16973 ◽  
Author(s):  
Thomas Tschentscher ◽  
Jochen R. Schneider ◽  
Friedhelm Bell
Keyword(s):  
Compton Scattering ◽  
Angular Correlation ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Momentum

Electronic Structure via 1D Electron Momentum Densities

2010 ◽  
Vol 666 ◽  
pp. 142-146
Author(s):  
G. Kontrym-Sznajd ◽  
M. Samsel-Czekała ◽  
S. Kaprzyk
Keyword(s):  
Electronic Structure ◽  
Compton Scattering ◽  
Angular Correlation ◽  
Annihilation Radiation ◽  
Electron Densities ◽  
Electron Momentum ◽  
One Dimensional ◽  
Crystal Orientations ◽  
Scattering Spectra ◽  
Extended Zone

We demonstrate what kind of information about the electronic structure one can get from plane projections of electron densities. As an example we use one dimensional (1D) angular correlation of annihilation radiation (ACAR) and Compton scattering spectra for Cd “measured” only for two crystal orientations. Spectra are interpreted in terms of reconstructed 2D densities both in the reduced and extended zone schemes.

scholarly journals Three-dimensional electron diffraction for porous crystalline materials: structural determination and beyond

2021 ◽  
Author(s):  
Zhehao Huang ◽  
Tom Willhammar ◽  
Xiaodong Zou
Keyword(s):  
Electron Diffraction ◽  
Three Dimensional ◽  
Structural Determination ◽  
New Materials ◽  
Dimensional Electron ◽  
X Ray Diffraction ◽  
Crystalline Materials ◽  
X Ray ◽  
Structural Details

Three-dimensional electron diffraction is a powerful tool for accurate structure determination of zeolite, MOF, and COF crystals that are too small for X-ray diffraction. By revealing the structural details, the properties of the materials can be understood, and new materials and applications can be designed.

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