Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.4: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B1
One-step or two-step core-resonant double photoemission from a Ag(100) surface — •Zheng Wei1, Frank O. Schumann1, Changhui Li1, Lucie Behnke1, Gianluca Di Fillippo2, Giovanni Stefani2, and Jürgen Kirschner1,3 — 1Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany — 2CNISM andDipartimento di Fisica, Università Roma Tre, I-00146 Rome, Italy 3Martin-Luther Universität, Halle,Germany — 3Martin-Luther Universität, 06120 Halle, Germany
We studied core-resonant double photoemission (DPE) from a Ag(100) surface with coincidence electron spectroscopy, and mapped out the two-dimensional energy distribution of the DPE pairs. Our experiments demonstrate that the photo-excited Auger transitions involving the Ag M4,5 core levels can be described by a simplified two-step picture, while the Auger transitions involving the Ag N2,3 core levels can only be described by a one-step picture. Since the final states of both Auger transitions are the same, this variation is purely due to the different initial core-hole state with different lifetime. We experimentally extracted the intrinsic line shapes of the M4,5VV Auger spectra, and found out the spectral weight transfer of the 3F4 component from the atomic- to the band-like region.