OBTAINING COORDINATION NUMBERS FROM EELFS SPECTRA

1997 ◽  
Vol 04 (05) ◽  
pp. 951-954 ◽  
Author(s):  
D. V. SURNIN ◽  
D. E. DENISOV ◽  
YU. V. RUTS
Keyword(s):  
Fine Structure ◽  
Energy Loss ◽  
Electron Energy ◽  
Structural Information ◽  
Quantitative Information ◽  
Distribution Functions ◽  
Radial Distribution Functions ◽  
Regularization Algorithm ◽  
Coordination Numbers ◽  
Electron Energy Loss

The electron energy loss fine structure (EELFS) method allows one to obtain information on atomic bond lengths from the surface to the bulk. But gaining more complete quantitative information for example on coordination numbers has not presently been realized. The possibility of obtaining normalized radial distribution functions (RDF's) is shown for EELFS spectra which may be used for deriving complete structural information on pure elements. RDF's were obtained by using the regularization algorithm (after A. N. Tikhonov). The method for obtaining the RDF's was applied to the experimental Fe M 2,3 EELFS spectrum.

Spectral Transformation of Exelfs Data and a Structural Examination of Nitrogen on Cu(100) and Cu(110) Surfaces

1990 ◽  
Vol 208 ◽  
Author(s):  
Q. Dai ◽  
A. J. Gellman
Keyword(s):  
Distribution Function ◽  
Fine Structure ◽  
Energy Loss ◽  
Radial Distribution Function ◽  
Electron Energy ◽  
Radial Distribution ◽  
Distribution Functions ◽  
Structural Examination ◽  
Spectral Integration ◽  
Electron Energy Loss

ABSTRACTEXtended Electron Energy Loss Fine Structure (EXELFS) spectra have been obtained above the K-edge of nitrogen atoms adsorbed on Cu. The radial distribution functions obtained from the fine structure indicate N-Cu bond lengths of 1.84(±.03) Å and 1.81(±.03) Å for nitrogen on the Cu(100) and Cu(110) surfaces respectively. As in previous EXELFS measurements, the actual measurements made are of N"(E) rather than direct measurement of N(E), the electron energy loss distribution. The EXELFS spectra from these two surfaces are used to illustrate the influence of this collection scheme on the radial distribution function obtained by Fourier transformation of the raw data. To obtain the direct analog of the radial distribution function found from the EXAFS experiment one must either resort to spectral integration or appropriate scaling of the distribution function found in the EXELFS experiment.

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