Hamburg 2009 – scientific programme

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A: Fachverband Atomphysik

A 34: Poster II

A 34.18: Poster

Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster

Kinematically complete (e, 2e) measurements of argon and argon dimers — •Thomas Pflueger, Xueguang Ren, Arne Senftleben, Alexander Dorn, and Joachim Ullrich — Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany

We present measurements of the triply differential cross-sections (TDCS) for argon and argon dimers for a incident energy of 100eV. These measurements have been carried out using a so-called reaction microscope (RM) which allows detection of the ejected electrons and residual ions over the whole solid angle.

The differences of the compared TDCS for Ar and Ar₂, though subtle in the projectiles scattering plane, are found to be larger outside of this plane. There, the dimer shows an enhanced intensity over the atom which can be explained by an increase of multiple scattering processes due to the additional scattering center. Furthermore, comparison of recent calculations and the measured TDCS for atomic argon show considerable discrepancies, even though the theory can reproduce measured data in the particles scattering plane reasonably.