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A: Atomphysik

A 14: Ion Scattering II (with molecules and surfaces)

A 14.2: Vortrag

Donnerstag, 5. April 2001, 16:00–16:15, H1028

Complete three body dissociation of CO₂ in collisions with 5.9 MeV/u highly charged Xe-ions — •B. Siegmann¹, I. Küster¹, U. Werner¹, H.O. Lutz¹, and R. Mann² — ¹Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld — ²Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt

We report measurements of the kinetic energy release (KER) distribution and angular distributions of fragment ions from collisions of CO₂ molecules with highly charged Xe-ions. The applied technique is based on a position- and time-sensitive multi-particle detector which allows the coincident measurement of the momenta of correlated fragment ions. If all fragments from a particular fragmentation are detected a kinematically complete study of the molecular break-up process is possible. In collisions with MeV/u Xe¹⁸⁺ and Xe⁴³⁺ ions processes leading to correlated C^p+ + O^q+ + O^r+ fragment ion triples with a total charge p+q+r up to at least 6 are observed. For these reactions the fragmentation dynamics may be analyzed in terms of three independent parameters which can be derived from the measured velocity vectors. A practical choice consists of the total kinetic energy release and two angles in velocity space. The derived energy and angular spectra are compared to the prediction of a point-charge Coulomb-explosion model.