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Träfflista för sökning "WFRF:(Brühwiler Paul) srt2:(2000-2004)"

Sökning: WFRF:(Brühwiler Paul) > (2000-2004)

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  • Schiessling, Joachim, et al. (författare)
  • Synchrotron radiation study of the electronic structure of multiwalled carbon nanotubes
  • 2003
  • Ingår i: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 15:38, s. 6563-
  • Tidskriftsartikel (refereegranskat)abstract
    • We present photoelectron (PE) and x-ray absorption spectra (XAS) of macroscopically aligned multiwalled carbon nanotubes. We identify the peaks in the valence PE spectra with regions of high density of states through comparison to calculations for graphite. Finally, we outline and illustrate a simple method for using XAS to determine the average alignment of a nanotube sample.
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  • Schnadt, Joachim, et al. (författare)
  • Electron-spectroscopy study of LiC60: Charge transfer and dimer formation
  • 2000
  • Ingår i: Physical Review B (Condensed Matter). - 0163-1829. ; 62, s. 4253-4253
  • Tidskriftsartikel (refereegranskat)abstract
    • Li−C60 compounds Lix¯C60 were studied for average Li concentration x¯<~1 using photoelectron spectroscopy. Strong evidence is found for the formation of LiC60 dimers, as well as a second phase. The study suggests that the smallest alkali-metal Li bonds to C60 largely ionically for certain configurations. An investigation of the Li 1s level shows that under certain conditions the energetics favor a backdonation of the transferred electron to the Li ion.
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  • Schnadt, Joachim, et al. (författare)
  • Experimental evidence for sub-3-fs charge transfer from an aromatic adsorbate to a semiconductor
  • 2002
  • Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 418:6898, s. 620-623
  • Tidskriftsartikel (refereegranskat)abstract
    • The ultrafast timescale of electron transfer processes is crucial to their role in many biological systems and technological devices. In dye-sensitized solar cells(1-4), the electron transfer from photoexcited dye molecules to nanostructured semiconductor substrates needs to be sufficiently fast to compete effectively against loss processes and thus achieve high solar energy conversion efficiencies(4). Time-resolved laser techniques indicate an upper limit of 20 to 100 femtoseconds(5-9) for the time needed to inject an electron from a dye into a semiconductor, which corresponds to the timescale on which competing processes such as charge redistribution(10,11) and intramolecular thermalization of excited states(12-14) occur. Here we use resonant photoemission spectroscopy, which has previously been used to monitor electron transfer in simple systems with an order-of-magnitude improvement in time resolution(15,16), to show that electron transfer from an aromatic adsorbate to a TiO2 semiconductor surface can occur in less than 3 fs. These results directly confirm that electronic coupling of the aromatic molecule to its substrate is sufficiently strong to suppress competing processes(17).
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  • Resultat 1-8 av 8

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