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|Type:||Artigo de periódico|
|Title:||L123m45m45 Auger Satellites Of The 4d Metals: Shake-up Or Coster-kronig?|
De Castro S.G.C.
|Abstract:||Interpretation of the satellites of the Cu L2,3M4,5M4,5 Auger spectrum has involved considerable controversy in recent years. Reaching unambiguous conclusions is impeded by the contribution of Coster-Kronig (CK) transitions, requiring considerable experimental investigation before clarifying the relative roles of shake-up and CK processes. The L2,3M4,5M4,5 spectra of Ag, Pd and Rh excited by bremsstrahlung also have satellite features and manifest experimental systematics consistent with 4d spectator vacancies produced by shake-up. The contribution of CK processes in the formation of these satellites, which, in this case, would have to involve the L1 level, is consistent with theoretical predictions, however. A direct determination of the role of CK processes is necessary, therefore, to resolve this issue. One possibility would be to measure the L1M4,5M4,5 spectum directly: were CK processes dominant, the spectrum should manifest no satellite. Direct measurement is difficult with bremsstrahlung excitation, however, because of the transition's low intensity. We report measurements of this spectrum in Ag, Pd and Rh and in Pd-Ag alloys using a Ti anode and demonstrate the presence of a satellite which is consistent in energy position and relative intensity with those of the L2,3MM satellites. This result supports the interpretation of these satellites as shake-up in nature. © 1998 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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