Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.112: Poster
Tuesday, March 24, 2009, 18:30–21:00, P2
Themis1000 - A new analyzer for three dimensional measurements — •Jens Kopprasch1,2, Martin Teichmann1, Oliver Schaff3, Sven Mähl3, and Martin Weinelt1,2 — 1Max-Born-Institut, Max-Born-Straße 2a, 12489 Berlin, Germany — 2Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany — 3SPECS GmbH, Voltastraße 5, 13355 Berlin, Germany
We present a newly developed time-of-flight (TOF) spectrometer to measure the energy and two-dimensional angle distribution of emitted electrons. For the development of this wide-angle high-energy resolution electron analyzer a partnership between the company SPECS GmbH and the Max-Born-Institute has been arranged.
The electrostatic lens system of a PHOIBOS electron analyzer is used as a flight tube, with a delay-line detector at the end to detect both flight time and arrival position. Due to the axial symmetry of the lens system the angular distribution is measurable in the two dimensions parallel to the sample surface. We reach the same good angular resolution as for a PHOIBOS analyzer, and the same acceptance angle of about 13∘. As opposed to an usual position-sensitive TOF spectrometer, the trajectory of the electrons are not linear. We could show that the mapping from arrival position to emission angle and flight time to energy is unambiguous, and by solving Hamiltons’ equations numerically we were able to invert this mapping.
Furthermore, we will show the first measurement of a Cu(111) sample. This is a known system well suited for the characterization of the analyzer.