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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.2: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Electron emission from He22+ quasi molecules — •Lothar P. H. Schmidt1, Reinhard Dörner2, Thorsten Weber1, Ottmar Jagutzki1, Feras Afaneh1, Oliver Hohn1, Kurt E. Stiebing1, and Horst Schmidt-Bocking1 — 1Institut für Kernphysik, Universität Frankfurt, Germany — 2Fakultät für Physik, Universität Freiburg, Germany
We studied the electron emission in He2+- He collisions at projectile velocities between 0.6 and 1 a.u., using recoil-ion-momentum-spectroscopy (COLTRIMS). A newly developed electron spectrometer with 4 π solid angle for slow electrons has been implemented for the determination of the electron 3-dimensional momentum vector. The final-state energy eigenvalue of the bound electron has been determined in addition to the complete momentum distribution of all particles. During the collision a He22+ quasi molecule is formed by the projectile and target atom. Electron emission from this molecule is possible by the saddle-point mechanism. Knowing the binding energy and the assignment of the remaining electron to one of the nuclei one can distinguish four ionisation channels. The structures of the differential cross sections and the relation between these ionisation channels will be discussed in a molecular orbital approach.