Bond lengths and coordination numbers fromL2,3-edge versusK-edge surface extended x-ray-absorption fine structure

1985 ◽  
Vol 31 (2) ◽  
pp. 700-721 ◽  
Author(s):  
P. H. Citrin
Keyword(s):  
Fine Structure ◽  
X Ray ◽  
Coordination Numbers ◽  
Bond Lengths ◽  
Absorption Fine ◽  
Edge Surface ◽  
X Ray Absorption

An Extended X-Ray-Absorption Fine-Structure Study of Bond Lengths in GaAs1-xPx

1986 ◽  
Vol 25 (Part 1, No. 2) ◽  
pp. 231-233 ◽  
Author(s):  
Toru Sasaki ◽  
Tomohiro Onda ◽  
Ryoichi Ito ◽  
Nagaatsu Ogasawara
Keyword(s):  
Fine Structure ◽  
Structure Study ◽  
X Ray ◽  
Bond Lengths ◽  
Absorption Fine ◽  
X Ray Absorption

scholarly journals X-Ray Absorption Spectroscopy from H-Passivated Porous Si and Oxidized Si Nanocrystals

1994 ◽  
Vol 375 ◽  
Author(s):  
S. Schuppler ◽  
S. L. Friedman ◽  
M. A. Marcus ◽  
D. L. Adler ◽  
Y.-H. Xie ◽  
...  
Keyword(s):  
Fine Structure ◽  
Quantum Confinement ◽  
Ir Absorption ◽  
X Ray ◽  
Coordination Numbers ◽  
Absorption Fine ◽  
Visible Luminescence ◽  
Si Nanocrystals ◽  
Wide Range ◽  
X Ray Absorption

AbstractQuantum confinement in nanoscale Si structures is widely believed to be responsible for the visible luminescence observed from anodically etched porous silicon (por-Si), but little is known about the actual size or shape of these structures. Extended x-ray absorption fine structure data from a wide variety of por-Si samples show significantly reduced average Si coordination numbers due to the sizable contribution of surface-coordinated H. (The H/Si ratios, as large as 1.2, were independently confirmed by ir-absorption and α-recoil measurements.) The Si coordinations imply very large surface/volume ratios, enabling the average Si structures to be identified as crystalline particles (not wires) whose dimensions are typically <15 Å. Comparison of the size-dependent peak luminescence energies with those of oxidized Si nanocrystals, whose shapes are known, shows remarkable agreement. Furthermore, near-edge x-ray absorption fine structure measurements of the nanocrystals shows the outer oxide and interfacial suboxide layers to be constant over a wide range of nanocrystal sizes. The combination of these results effectively rules out surface species as being responsible for the observed visible luminescence in por-Si, and strongly supports quantum confinement as the dominant mechanism occurring in Si particles which are substantially smaller than previously reported or proposed.

Bonding and Bond Lengths of Chemisorbed Molecules from Near-Edge X-Ray-Absorption Fine-Structure Studies

1983 ◽  
Vol 51 (26) ◽  
pp. 2414-2417 ◽  
Author(s):  
J. Stöhr ◽  
J. L. Gland ◽  
W. Eberhardt ◽  
D. Outka ◽  
R. J. Madix ◽  
...  
Keyword(s):  
Fine Structure ◽  
X Ray ◽  
Bond Lengths ◽  
Absorption Fine ◽  
X Ray Absorption
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