Premium
Optimization of ELNES processing using a four‐parameter function: application to SiC fibers
Author(s) -
Varlot K.,
Martin J. M.
Publication year - 1999
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/(sici)1096-9918(199901)27:1<29::aid-sia458>3.0.co;2-5
Subject(s) - ionization , atomic orbital , spectral line , x ray photoelectron spectroscopy , gaussian , atomic physics , chemical bond , chemistry , ionization energy , excited state , linear combination of atomic orbitals , molecular physics , molecular orbital , materials science , computational chemistry , molecule , physics , nuclear magnetic resonance , quantum mechanics , ion , organic chemistry , electron
In the explanation of EELS spectra in terms of molecular orbitals,where the local band structure is approximated as a linearcombination of atomic orbitals of the excited atom and its immediateneighbours, K and L core‐loss spectra are decomposed using afour‐parameter function that models the ionization continuumin a better way than ‘classical’ step functions. Thepeaks corresponding to particular chemical bondings are extracted andthen fitted by Gaussian functions. The accuracy of such a technique is discussed in the case ofNicalon SiC fibre compared to pure α‐SiC. Because ofthis ionization continuum subtraction we found, in agreement withprevious XPS data, that the fibre contains a particular SiCO bondingthat is different from SiC and SiO and was not visible without thistreatment. Moreover, the CK‐edge analysis shows the presenceof graphite‐like carbon. The existence of CH bonding is alsodiscussed. © 1999 John Wiley & Sons, Ltd.