Ultrafast charge transfer and atomic orbital polarization

Summary, in English

The role of orbital polarization for ultrafast charge transfer between an atomic adsorbate and a substrate is explored. Core hole clock spectroscopy with linearly polarized x-ray radiation allows to selectively excite adsorbate resonance states with defined spatial orientation relative to the substrate surface. For c(4x2)S/Ru(0001) the charge transfer times between the sulfur 2s(-1)3p(*+1) antibonding resonance and the ruthenium substrate have been studied, with the 2s electron excited into the 3p(perpendicular to)(*) state along the surface normal and the 3p(parallel to)(*) state in the surface plane. The charge transfer times are determined as 0.18 +/- 0.07 and 0.84 +/- 0.23 fs, respectively. This variation is the direct consequence of the different adsorbate-substrate orbital overlap.

• Författare: M. Deppe; A. Foehlisch; Franz Hennies; D. Sanchez-Portal; P. M. Echenique; W. Wurth
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2007
• Språk: Engelska
• Publikation/Tidskrift/Serie: Journal of Chemical Physics
• Volym: 127
• Issue: 17
• Länkar: http://dx.doi.org/10.1063/1.2781395
• Dokumenttyp: Artikel i tidskrift
• Förlag: American Institute of Physics (AIP)
• Ämne: Natural Sciences; Physical Sciences
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0021-9606