Comparison of hard and soft x-ray photoelectron spectra of silicon (Articolo in rivista)

Type
Label
  • Comparison of hard and soft x-ray photoelectron spectra of silicon (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.76.085422 (literal)
Alternative label
  • Offi, F; Werner, WSM; Sacchi, M; Torelli, P; Cautero, M; Cautero, G; Fondacaro, A; Huotari, S; Monaco, G; Paolicelli, G; Smekal, W; Stefani, G; Panaccione, G (2007)
    Comparison of hard and soft x-ray photoelectron spectra of silicon
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Offi, F; Werner, WSM; Sacchi, M; Torelli, P; Cautero, M; Cautero, G; Fondacaro, A; Huotari, S; Monaco, G; Paolicelli, G; Smekal, W; Stefani, G; Panaccione, G (literal)
Pagina inizio
  • 085422 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 76 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma Tre, CNISM, I-00146 Rome, Italy; Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy; Vienna Univ Technol, Inst Allgemeine Phys, A-1040 Vienna, Austria; Synchroton Soleil, F-91142 Gif Sur Yvette, France; Univ Paris 06, Lab Chim Phys Mat & Rayonnement, UMR 7614, F-75005 Paris, France; CNR INFM S3, I-41100 Modena, Italy; Sincrotrone Trieste SCpA, I-34012 Trieste, Italy; European Synchrotron Radiat Facil, F-38042 Grenoble, France; Area Sci Pk, CNR, INFM, Lab Nazl TASC, I-34012 Trieste, Italy (literal)
Titolo
  • Comparison of hard and soft x-ray photoelectron spectra of silicon (literal)
Abstract
  • A detailed comparison of the surface sensitivity of x-ray photoemission spectroscopy for hard and soft x rays is presented and discussed. Electron scattering parameters and their energy dependence are given for Si and two Si spectra are analyzed: a Mg K alpha (h nu=1253.6 eV) excited spectrum of the Si 2p and 2s lines and a hard x-ray excited spectrum (h nu=5925 eV) of the Si 1s line. The differential inelastic scattering characteristics for Si are extracted from reflection electron energy loss spectra taken at energies of 1500 and 4000 eV. Using these scattering characteristics and electron mean free paths from the literature, simulated spectra are compared with experiment. The experimental spectra are deconvoluted to give the true intrinsic line shape corresponding to the theoretical collision statistics when interference effects between intrinsic and extrinsic scattering are neglected. The magnitude of interference effects cannot be assessed by our analysis. Within the (unknown) uncertainty introduced by neglecting interference effects, it is possible to determine the relative intensity of intrinsic and extrinsic excitations. In this way, it is found that in the case of the soft x-ray excited photoelectron spectrum of the shallower electronic shells (2p and 2s), intrinsic plasmon creation is rather weak, and the apparent asymmetric line shape of the spectrum might be interpreted as the fact that electron-hole pair creation dominates the intrinsic loss spectrum, while an alternative explanation in terms of surface core level shifted components is also proposed. For the deeper core electronic shell, probed with hard x rays, the opposite situation is observed: while intrinsic electron-hole pair creation was not observed, a strong contribution of intrinsic plasmon losses of about 30% was seen. (literal)
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