Extra-atomic relaxation energies and auger parameters of titanium compounds

Autor: X. J. Gu, C. M. Woodbridge, Marjorie A. Langell
Rok vydání: 1999
Předmět:
Zdroj: Surface and Interface Analysis. 27:816-824
ISSN: 1096-9918
0142-2421
DOI: 10.1002/(sici)1096-9918(199909)27:9<816::aid-sia637>3.0.co;2-e
Popis: A series of titanium compounds have been studied by x-ray photoelectron spectroscopy within the Auger parameter formalism. Two different titanium Auger parameters are reported, both calculated from binding energies resulting from photoemission from Ti 2p3/2 core-level states. Of the two values, one has been commonly used for titanium Auger parameter analysis and involves a valence-level Auger transition (L3M2,3Mv), whereas the other is based purely on core-level transitions (L3M2,3M2,3). Both parameters correlate roughly with each other and with extra-atomic relaxation energies calculated from surrounding nearest-neighbor anion polarizabilities. However, the core-level-based Auger parameter shows significantly better correlation with predicted relaxation energy values, particularly when corrections are made for M2,3 multiplet splittings in the analysis. The ability to model extra-atomic relaxation with polarization energies suggests that the ligand polarizabilities in titanium thin-film and powder samples may be estimated reliably from Auger parameter data despite the high degree of covalent character found in many of these compounds. Copyright © 1999 John Wiley & Sons, Ltd.
Databáze: OpenAIRE
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