Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 7: Wechselwirkung von Materie mit Ionen
A 7.3: Vortrag
Dienstag, 14. März 2006, 15:00–15:15, H7
New measurements on the Casimir-Polder force between a 3He atom and a dielectric surface — •Lodewijk Arntzen — Physikalisches Institut Heidelberg, Philosophenweg 12, 69120 Heidelberg.
We measured the Casimir-Polder force between a 3He atom and a variety of surfaces making use of quantum reflection. This force depends on the polarizability of the atom, and the dielectric function of the surface. Recently, we measured the retarded potential parameter C4, of a 3He atom and silicon while varying the temperature of the substrate between 300 and 1200 K. The dielectric function of a semi-conductor depends strongly on temperature. Experimentally, we find C4 to change by a factor 1.6±0.016 in this range. In our analysis, we include a detailed model of the dynamic dielectric function of silicon, in order to extract the temperature dependence of the Casimir-Polder force from our data.