Dynamic pair-density function method for neutron and X-ray inelastic scattering

2012 ◽  
Vol 227 (5) ◽  
pp. 233-237 ◽  
Author(s):  
Takeshi Egami ◽  
Wojtek Dmowski
Keyword(s):  
Inelastic Scattering ◽  
Density Function ◽  
Function Method ◽  
X Ray ◽  
Pair Density

Local atomic structure in disordered and nanocrystalline catalytic materials

2007 ◽  
Vol 222 (11/2007) ◽  
Author(s):  
Wojtek Dmowski ◽  
Takeshi Egami ◽  
Karen E. Swider-Lyons ◽  
Wen-Fu Yan ◽  
Sheng Dai ◽  
...  
Keyword(s):  
Density Function ◽  
Atomic Structure ◽  
Function Method ◽  
Gold Catalyst ◽  
Iron Phosphate ◽  
Local Atomic Structure ◽  
Catalytic Materials ◽  
Atomic Pair ◽  
Pair Density

The power of the atomic pair density function method to study the local atomic structure of dispersed materials is discussed for three examples (I) supercapacitor hydrous ruthenia, (II) electroctalyst platinum-iron phosphate and (III) nanoparticle gold catalyst. Hydrous ruthenia appears to be amorphous, but was found to be nanocomposite with RuO

The structure of amorphous and polycrystalline materials using energy-filtered RDF analysis

1992 ◽  
Vol 50 (2) ◽  
pp. 1190-1191
Author(s):  
David Cockayne ◽  
David McKenzie
Keyword(s):  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Density Function ◽  
Electron Diffraction Pattern ◽  
Polycrystalline Materials ◽  
Nearest Neighbour ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Reduced Density ◽  
System F

The technique of Electron Reduced Density Function (RDF) analysis has ben developed into a rapid analytical tool for the analysis of small volumes of amorphous or polycrystalline materials. The energy filtered electron diffraction pattern is collected to high scattering angles (currendy to s = 2 sinθ/λ = 6.5 Å-1) by scanning the selected area electron diffraction pattern across the entrance aperture to a GATAN parallel energy loss spectrometer. The diffraction pattern is then converted to a reduced density function, G(r), using mathematical procedures equivalent to those used in X-ray and neutron diffraction studies.Nearest neighbour distances accurate to 0.01 Å are obtained routinely, and bond distortions of molecules can be determined from the ratio of first to second nearest neighbour distances. The accuracy of coordination number determinations from polycrystalline monatomic materials (eg Pt) is high (5%). In amorphous systems (eg carbon, silicon) it is reasonable (10%), but in multi-element systems there are a number of problems to be overcome; to reduce the diffraction pattern to G(r), the approximation must be made that for all elements i,j in the system, fj(s) = Kji fi,(s) where Kji is independent of s.

X-ray inelastic scattering from small particles of graphite

1981 ◽  
Vol 85 (2) ◽  
pp. 115-117
Author(s):  
G.D. Priftis ◽  
J. Boviatsis
Keyword(s):  
Inelastic Scattering ◽  
Small Particles ◽  
X Ray

A band-structure-based approach to modeling x-ray absorption, fluorescence, and resonant inelastic scattering

2000 ◽  
Author(s):  
Eric L. Shirley ◽  
J. A. Carlisle ◽  
S. R. Blankenship ◽  
R. N. Smith ◽  
L. J. Terminello ◽  
...  
Keyword(s):  
Band Structure ◽  
Inelastic Scattering ◽  
X Ray ◽  
X Ray Absorption

An X-ray spectrometer for inelastic scattering experiments. II. Spectral flux and resolution

1986 ◽  
Vol 19 (5) ◽  
pp. 343-352 ◽  
Author(s):  
P. Suortti ◽  
P. Pattison ◽  
W. Weyrich
Keyword(s):  
Inelastic Scattering ◽  
X Ray ◽  
Spectral Flux
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