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Matrix effects in the Auger analysis of Al-Cu alloys
A154 902
Surface Science 152/153 (1985) 902-910 North-Holland, Amsterdam
A COMPARISON OF LOW ENERGY AUGER SPECTRA OF THE NITRIDES AND OXIDES OF THE LIGHT ELEMENTS LITHIUM, BERYLLIUM G. H A N K E
AND BORON a n d K. M U L L E R
Lehrstuhl fi~r FestkOrperphysik, Universiti~t Erlangen - N~rnberg, Erwin - Rommel- Strasse 1, D-8520 Erlangen, Fed. Rep. of Germany Received 1 April 1984; accepted for publication 27 May 1984
Auger spectra obtained from nitrides and oxides of the light elements lithium, beryllium and boron are presented. A comparison of the new data for Li3N and Be3N 2 with those observed for BN and the oxides of these elements reveal certain similarities. In contrast to the pure elements having only one decay channel the low energy Auger transition of the electropositive partner in these binary compounds is generally split into a multiplet of several lines. The Auger features of the three elements are quite similar in their oxide spectra as well as in their nitride spectra. However, the energy separation of the lines in the multiplets of Li, Be and B varies with different electronegative partners in the compound. The effect is controlled by the L 1 levels of nitrogen and oxygen, which open with their local density of states extra decay channels at the site of the excited atom. Some features in the spectra, however, require further consideration. The high energy peak of BN may be the direct nonradiative recombination of a core exciton. For the interpretation of the low energy line of each multiplet two alternative models can be applied. According to the first one it may be due to a double Auger transition involving an unoccupied, localized level in the final state. The other model assumes partial localization in the bonding which results in different final states due to distinct effective interaction energies of the two holes.
Surface Science 152/153 (1985) 911-916 North-Holland, Amsterdam MATRIX EFFECTS
911
IN THE AUGER ANALYSIS OF AI-Cu ALLOYS
W. P A M L E R Institut far Angewandte Physik, University of Regensburg, D - 8400 Regensburg, Fed Rep. of Germany Received 1 April 1984 Although variations of density, escape depth, and backscattering factor are principal problems for quantitative Auger analysis these matrix effects can be eliminated by an appropriate correction factor. The aim of this paper is to find this parameter only from experimental methods. Calculations using empirical or theoretical equations should be avoided. As another condition, the composition of the samples needed for the correction method should be kept unknown. The formalism is applied to AI-Cu alloys. By comparison with standards of well-known compositions, it is demonstrated that the correction factor determined by that method leads to a considerable improvement of quantitative Auger analysis.
Surface Science 152/153 (1985) 902-910 North-Holland, Amsterdam
A COMPARISON OF LOW ENERGY AUGER SPECTRA OF THE NITRIDES AND OXIDES OF THE LIGHT ELEMENTS LITHIUM, BERYLLIUM G. H A N K E
AND BORON a n d K. M U L L E R
Lehrstuhl fi~r FestkOrperphysik, Universiti~t Erlangen - N~rnberg, Erwin - Rommel- Strasse 1, D-8520 Erlangen, Fed. Rep. of Germany Received 1 April 1984; accepted for publication 27 May 1984
Auger spectra obtained from nitrides and oxides of the light elements lithium, beryllium and boron are presented. A comparison of the new data for Li3N and Be3N 2 with those observed for BN and the oxides of these elements reveal certain similarities. In contrast to the pure elements having only one decay channel the low energy Auger transition of the electropositive partner in these binary compounds is generally split into a multiplet of several lines. The Auger features of the three elements are quite similar in their oxide spectra as well as in their nitride spectra. However, the energy separation of the lines in the multiplets of Li, Be and B varies with different electronegative partners in the compound. The effect is controlled by the L 1 levels of nitrogen and oxygen, which open with their local density of states extra decay channels at the site of the excited atom. Some features in the spectra, however, require further consideration. The high energy peak of BN may be the direct nonradiative recombination of a core exciton. For the interpretation of the low energy line of each multiplet two alternative models can be applied. According to the first one it may be due to a double Auger transition involving an unoccupied, localized level in the final state. The other model assumes partial localization in the bonding which results in different final states due to distinct effective interaction energies of the two holes.
Surface Science 152/153 (1985) 911-916 North-Holland, Amsterdam MATRIX EFFECTS
911
IN THE AUGER ANALYSIS OF AI-Cu ALLOYS
W. P A M L E R Institut far Angewandte Physik, University of Regensburg, D - 8400 Regensburg, Fed Rep. of Germany Received 1 April 1984 Although variations of density, escape depth, and backscattering factor are principal problems for quantitative Auger analysis these matrix effects can be eliminated by an appropriate correction factor. The aim of this paper is to find this parameter only from experimental methods. Calculations using empirical or theoretical equations should be avoided. As another condition, the composition of the samples needed for the correction method should be kept unknown. The formalism is applied to AI-Cu alloys. By comparison with standards of well-known compositions, it is demonstrated that the correction factor determined by that method leads to a considerable improvement of quantitative Auger analysis.