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MS: Fachverband Massenspektrometrie

MS 1: Precision Mass Spectrometry and Fundamental Applications I

MS 1.4: Vortrag

Montag, 18. März 2013, 12:00–12:15, F 442

Investigation of the work function fluctuations for high precision experiments — •Christian Schmidt¹, Martin Babutzka², Matt Bahr³, Marcus Beck¹, Werner Heil¹, Benjamin Monreal³, Ernst-Wilhelm Otten¹, Klaus Schlösser², Kerstin Schönung², and Alexander Wunderle¹ — ¹Institut für Physik, Mainz — ²Institut für Experimentelle Kernphysik, Karlsruhe — ³Department of Physics, Santa Barbara, California

High precision experiments at low energies are an important branch for the investigation of atomic properties. Examples are experiments using Penning traps for mass measurements or g-factor measurements, experiments using a gravitational balance to search for short range interactions, and experiments utilizing MAC-E filters.

The knowledge of the electrical potentials and potential differences inside these experiments is a crucial factor to achieve the best results. However, the potentials are directly influenced by the work function of the electrodes, which can show fluctuations of several hundred meV .

For the low energy, precision experiments aSPECT and KATRIN we commissioned and studied a scanning Kelvin probe system to investigate the work function fluctuations of different gold surfaces on different substrates. Since the Kelvin probe is a relative method, also photoelectron spectroscopy was performed additionally to obtain information on the absolute work functions. The work functions of the surfaces were also tested on their stability in time, and on a standard vacuum cleaning procedure and a bake out. This talk will present the results of the measurements.