Si 1s-1, 2s-1 and 2p-1 lifetime broadening of SiX4 (X = F, Cl, Br, CH3) molecules: SiF4 anomalous behaviour reassessed

Ralph Püttner, Tatiana Marchenko, Renaud Guillemin, Loïc Journel, Gildas Goldsztejn, Denis Céolin, Osamu Takahashi, Kiyoshi Ueda, Alexsandre F. Lago, Maria Novella Piancastelli, Marc Simon

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3 Citations (Scopus)


The Si 1s-1, Si 2s-1, and Si 2p-1 photoelectron spectra of the SiX4 molecules with X = F, Cl, Br, CH3 were measured. From these spectra the Si 1s-1 and Si 2s-1 lifetime broadenings were determined, revealing a significantly larger value for the Si 2s-1 core hole of SiF4 than for the same core hole of the other molecules of the sequence. This finding is in line with the results of the Si 2p-1 core holes of a number of SiX4 molecules, with an exceptionally large broadening for SiF4. For the Si 2s-1 core hole of SiF4 the difference to the other SiX4 molecules can be explained in terms of Interatomic Coulomb Decay (ICD)-like processes. For the Si 2p-1 core hole of SiF4 the estimated values for the sum of the Intraatomic Auger Electron Decay (IAED) and ICD-like processes are too small to explain the observed linewidth. However, the results of the given discussion render for SiF4 significant contributions from Electron Transfer Mediated Decay (ETMD)-like processes at least plausible. On the grounds of our results, some more molecular systems in which similar processes can be observed are identified.

Original languageEnglish
Pages (from-to)8827-8836
Number of pages10
JournalPhysical Chemistry Chemical Physics
Issue number17
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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