Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 90: Electronic structure of surfaces: Spectroscopy, surface states IV

O 90.9: Vortrag

Donnerstag, 15. März 2018, 12:30–12:45, MA 042

The XPS limit within the one-step model of photoemission: an application to Ag(100) — •Laurent Nicolaï¹, Vladimir Strocov³, Juraj Krempaský³, Hubert Ebert², Jürgen Braun², Federico Bisti³, and Ján Minár¹ — ¹Univiversity of West Bohemia, Plzeň, Czech Republic — ²Ludwig-Maximilians-Universität Munich, Germany — ³Paul Scherrer Institut, Villigen, Suisse

Angle-Resolved Photoemission Spectroscopy (ARPES) is the method of choice for characterising the electronic structure of a given crystalline material. Within the Ultra-Violet (UV) regime, theory can nicely reproduce experimental spectra using the k-conserving dipole selection rules within the one-step model of photoemission [1,2]. Yet, this model is no longer sufficient when dealing with the soft/hard X-ray or high temperature regimes: the XPS-limit. For this case, one has phonon-assisted electronic transitions such that the dipole selection rules cannot describe by themselves the experimentally obtained spectra [3]. Here we use the so-called alloy analogy model in order to quantify the importance of non-dipole transitions. This rather new model is here tested by comparison to new experimental data obtained for the Ag(100) sytem. [1] J. Braun, Rep. Prog. Phys. 59, 1267-1338 (1996), [2] H. Ebert, D. Ködderitzsch and J. Minár, Rep. on Prog. in Phys. 74, 096501 (2011), [3] J. Braun et al., Phys. Rev. B 88, 205409 (2013)