Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 14: Posters: Interaction of matter with ions
A 14.5: Poster
Tuesday, March 11, 2008, 16:30–18:30, Poster C3
Two Center Cnterference in Collisions between H2+ and He — •Shaofeng Zhang1,3, Jan Suske1, Daniel Fischer4, Kai-Uwe Kuehnel1, Siegbert Hagmann2, Andreas Krauss1, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, German — 2Gesellschaft für Schwerionenforschung, Planckstr. 1,64291 Darmstadt, Germany — 3Institute of Modern Physics, CAS, Lanzhou 730000, China — 4Stockholm University, AlbaNova University Centre, 10691 Stockholm, Sweden
Two-center interference effects in collisions of fast ions with H2 molecules have been intensively studied both theoretically(e.g.[1]) and experimentally(e.g.[2]). We investigated in a kinematically complete experiment the ionization of a neutral He target in collisions with H2+-molecular ions at 0.5 and 1 MeV. The momenta of the recoiling He ions and the electrons produced in the collisions were measured using a “Reaction Microscope" [3]. The fragments of the H2+ were separated by a dipole magnet after the interaction region and detected by two position sensitive MCP detectors. From this information the orientation and internuclear distance of the molecular ion at the instant of the collision could be determined. We will report on the appearance of interference effects in the differential data which should arise due to the two centers potential of the molecular projectile.
[1] S. E. Corchs et al., Nucl. Instrum. Methods Phys. Res., Sect. B 149, 247 (1999). [2] N. Stolterfoht et al., Phys. Rev. Lett. 87, 023201 (2001). [3] Ullrich et al., Rep. Prog. Phys. 66, 1463 (2003)