Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.2: Poster

Wednesday, February 27, 2008, 18:30–19:30, Poster F

Combined direct and inverse photoemission experiment: A thorough characterization of energy, angle and spin resolution — •Michael Budke, Tobias Allmers, and Markus Donath — Physikalisches Institut, WWU Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

We present an experimental setup that combines spin- and angle-resolved direct (PE) and inverse photoemission (IPE) in one UHV chamber [1], allowing measurements of the spin-resolved electronic structure below and above the Fermi level of the same sample preparation. The system for PE operates with a gas discharge lamp and an electron analyzer combined with a SPLEED detector. Our spectrometer for IPE [2] is home-made and comprises a spin-polarized electron source and energy-selective Geiger-Müller counters for photon detection. The achievable energy resolutions are better than 50 meV for PE and better than 200 meV for IPE. The latter value states an improvement of a factor of two compared to other state-of-the-art IPE spectrometers. The high energy resolution makes the setup especially suitable for studies in the close vincinity of the Fermi level.

In this contribution, the two spectrometers are characterized concerning energy and angle resolution by means of the Fermi-level crossing of the L-gap surface state on Cu(111). Spin-resolved measurements of Co/Cu(100) will be presented combined with a characterization of the spin polarization of the electron beam and the Sherman function of the SPLEED detector. [1] M. Budke et al., RSI 78, (in press).

[2] M. Budke et al., RSI 78, 083903 (2007).