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Resonant Photoemission at the 2p Edges of Ni: Resonant Raman and Interference Effects
Uppsala University.
Uppsala University.
Uppsala University.ORCID iD: 0000-0002-0317-0190
Uppsala University.
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1997 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 78, no 5, 967-970 p.Article in journal (Refereed) Published
Abstract [en]

Unambiguous evidence for resonant photoemission in Ni is presented. Interference effects are identified at the 2p edges for the valence band and the 6 eV satellite. A rapid transition from a resonant Raman to an Auger-like regime shows that the core-excited states above threshold are not localized enough to significantly enhance the photoemission intensity, implying a large fraction of incoherent intensity. The results indicate that the appearance of interference effects does not require strong localization of the intermediate state.

Place, publisher, year, edition, pages
1997. Vol. 78, no 5, 967-970 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-17473DOI: 10.1103/PhysRevLett.78.967OAI: oai:DiVA.org:liu-17473DiVA: diva2:209616
Note
Original Publication:M. Weinelt, A. Nilsson, Martin Magnuson, T. Wiell, N. Wassdahl, O. Karis, A. Föhlisch, N. Mårtensson, J. Stöhr and M. Samant, Resonant Photoemission at the 2p Edges of Ni: Resonant Raman and Interference Effects, 1997, Physical Review Letters, (78), 5, 967-970.http://dx.doi.org/10.1103/PhysRevLett.78.967Copyright: American Physical Societyhttp://www.aps.org/Available from: 2009-03-26 Created: 2009-03-25 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Electronic Structure Studies Using Resonant X-ray and Photemission Spectroscopy
Open this publication in new window or tab >>Electronic Structure Studies Using Resonant X-ray and Photemission Spectroscopy
1999 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis addresses the electronic structure of molecules and solids using resonant X-ray emission and photoemission spectroscopy. The use of monochromatic synchrotron radiation and the improved performance of the instrumentation have opened up the possibility of detailed analyses of the response of the electronic systems under interaction with X-rays. The experimental studies are accompanied by numerical ab initio calculations in the formalism of resonant inelastic scattering. The energy selectivity has made it possible for the first time to study how the chemical bonds in a molecule break up during resonant inelastic X-ray scattering. In the conjugated polymer systems, the element selectivity of the X-ray emission process made it possible to probe the different atomic elements separately. The X-ray emission technique proved to be useful for extracting isomeric information, and for measuring the change in the valence levels at different degrees of doping. In this thesis, spectral satellite features in transition metals were thoroughly investigated for various excitation energies around a core-level threshold. By measuring the relative spectral intensity of the satellites it was possible to extract information on the partial core-level widths. Using the nickel metal system as an example, it was shown that it is possible to probe the different core-excited states close toshake-up thresholds by measuring the relative spectral intensity variation of the Auger emission.Resonant photoemission measurements showed unambiguous evidence of interference effects. Theseeffects were also thoroughly probed using angle-dependent measurements. The combination of X-rayemission and absorption were useful for studying buried layers and interfaces due to the appreciable penetration depth of soft X-rays. X-ray scattering was further found to be useful for studying low-energy excited states of rare earth metallic compounds and transition metal oxides.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, 1999
Series
Acta Universitatis Upsaliensis, ISSN 1104-232X ; 452
Keyword
Electronic structure, resonant x-ray emission, photoemission spectroscopy
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-56480 (URN)91-554-4463-6 (ISBN)
Public defence
(English)
Opponent
Available from: 2010-05-19 Created: 2010-05-18 Last updated: 2013-11-14Bibliographically approved

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