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Ultrafast charge transfer and atomic orbital polarization

2007; American Institute of Physics; Volume: 127; Issue: 17 Linguagem: Inglês

10.1063/1.2781395

1520-9032

Martin H. Deppe, Alexander Föhlisch, Franz Hennies, Mitsuru Nagasono, Martin Beye, Daniel Sánchez‐Portal, P. M. Échenique, W. Würth,

X-ray Spectroscopy and Fluorescence Analysis

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(4×2)S∕Ru(0001) the charge transfer times between the sulfur 2s−13p*+1 antibonding resonance and the ruthenium substrate have been studied, with the 2s electron excited into the 3p⊥* state along the surface normal and the 3p‖* state in the surface plane. The charge transfer times are determined as 0.18±0.07 and 0.84±0.23fs, respectively. This variation is the direct consequence of the different adsorbate-substrate orbital overlap.