Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/101315
Type: Artigo
Title: Photon energy and core hole lifetime dependences of Ag high energy Auger satellites
Author: Morais, J.
Siervo, A. de
Landers, R.
Castro, S. G. C. de
Kleiman, G. G.
Abstract: Understanding metallic response to the presence of a dynamic, localized perturbation, such as a finite lifetime core hole, has been the theme of many studies. Although, in XPS of such metals as Ni and Pd, shake-up satellites are common, in Auger spectroscopy, an intrinsic laboratory of many-body effects, the most extensively studied metal, Cu, manifests LVV satellites which are associated with Coster-Kronig (CK) transitions. Unambiguously identified shake-up satellites have been observed in the L123M45M45 spectra of the 4d metals, studied with conventional X-ray sources and, in the L3 threshold region, with synchrotron radiation. There remain questions concerning the origin of these satellites and their relation to the corresponding XPS spectra. Here, we report a study of the Ag L23M45M45 spectra as a function of photon energy and demonstrate the evolution of the satellite spectra. The change of the satellite shapes with photon energy is directly related to the validity of the sudden approximation. Correlation of the satellite spectra with core level lifetime indicates the influence of core hole dynamics. From the experimental systematics, it becomes clear that isolation of CK effects is very difficult.
Understanding metallic response to the presence of a dynamic, localized perturbation, such as a finite lifetime core hole, has been the theme of many studies. Although, in XPS of such metals as Ni and Pd, shake-up satellites are common, in Auger spectroscopy, an intrinsic laboratory of many-body effects, the most extensively studied metal, Cu, manifests LVV satellites which are associated with Coster-Kronig (CK) transitions. Unambiguously identified shake-up satellites have been observed in the L123M45M45 spectra of the 4d metals, studied with conventional X-ray sources and, in the L3 threshold region, with synchrotron radiation. There remain questions concerning the origin of these satellites and their relation to the corresponding XPS spectra. Here, we report a study of the Ag L23M45M45 spectra as a function of photon energy and demonstrate the evolution of the satellite spectra. The change of the satellite shapes with photon energy is directly related to the validity of the sudden approximation. Correlation of the satellite spectra with core level lifetime indicates the influence of core hole dynamics. From the experimental systematics, it becomes clear that isolation of CK effects is very difficult.
Understanding metallic response to the presence of a dynamic, localized perturbation, such as a finite lifetime core hole, has been the theme of many studies. Although, in XPS of such metals as Ni and Pd, shake-up satellites are common, in Auger spectroscopy, an intrinsic laboratory of many-body effects, the most extensively studied metal, Cu, manifests LVV satellites which are associated with Coster–Kronig (CK) transitions. Unambiguously identified shake-up satellites have been observed in the L123M45M45 spectra of the 4d metals, studied with conventional X-ray sources and, in the L3 threshold region, with synchrotron radiation. There remain questions concerning the origin of these satellites and their relation to the corresponding XPS spectra. Here, we report a study of the Ag L23M45M45 spectra as a function of photon energy and demonstrate the evolution of the satellite spectra. The change of the satellite shapes with photon energy is directly related to the validity of the sudden approximation. Correlation of the satellite spectra with core level lifetime indicates the influence of core hole dynamics. From the experimental systematics, it becomes clear that isolation of CK effects is very difficult.
Subject: Espectros Auger
Prata
Radiação sincrotrônica
Espectroscopia fotoeletrônica
Country: Holanda
Editor: Elsevier
Citation: Surface Science. Elsevier Science B.v., Amsterdam, Netherlands, v. 433, n. , p. 878 - 881, 1999.
Rights: fechado
Identifier DOI: 10.1016/S0039-6028(99)00150-8
Address: https://www.sciencedirect.com/science/article/pii/S0039602899001508
Date Issue: 1999
Appears in Collections:IFGW - Artigos e Outros Documentos

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