Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Poster I - Collisions with electrons and ions

A 11.10: Poster

Dienstag, 20. März 2007, 16:30–18:30, Poster B

Kinematically complete study on transfer-excitation in intermediate-energy p-He collisions — Myroslav Zapukhlyak¹, •Tom Kirchner¹, Ahmad Hasan^2,3, Brian Tooke², and Michael Schulz² — ¹Institut für Theoretische Physik, TU Clausthal, Leibniz-straße 10, 38678 Clausthal-Zellerfeld — ²Physics Department and Laboratory for Atomic, Molecular, and Optical Research, University of Missouri-Rolla, Rolla, Missouri 65409, USA — ³Department of Physics, UAE University, P.O. Box 17551, Alain, Abu Dhabi, United Arab Emirates

Very recently, we have reported the first measured differential cross sections for transfer excitation in p-He collisions at 25, 50, and 75 keV impact energy. A comparison with double excitation data and with nonperturbative time-dependent calculations indicated that dynamic couplings between the motion of the heavy particles and the electronic transitions and/or electron-electron correlation effects must play a role in these processes [1].

Refined calculations on the basis of the eikonal approximation for the extraction of differential cross sections give a more definite answer: they show that it is the quantal nature of the heavy particle-electron coupling that produces experimentally observed structures in double ratios of transfer-excitation to single capture and double to single excitation cross sections.

[1] A. Hasan et al, Phys. Rev. A 74, 032703 (2006)