Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.16: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Fragmentation and energy loss in C604+-C60 collisions — •Henning Lebius1, Henning Schmidt2, Seguiro Tomita1, Preben Hvelplund3, Henrik Cederquist2, and Bernd Huber1 — 1Departement de Recherche Fondamentale sur la Matiere Condensee, S12A, IMC CEA-Grenoble, 17, rue des Martyrs, F38054 Grenoble-Cedex 9, France — 2Stockholm University, Frecativägen 24, S-104 05 Stockholm, Sweden — 3Institute for Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
We have studied electron capture and fragmentation in C604+-C60 collision at a relative velocity of 0.024 a.u. The measured energy losses for emission of m C2-units from the projectile for single- and double-electron capture are found to lie between 12m and 24m eV. The lower limit is compatible with emission of m C2-units (assumed activation energy of 12 eV) from the projectile only, while the upper limit requires emission of m fragments also from the target. The mechanism is mainly elastic scattering, as corroborated by our Monte Carlo calculations for C-C60 collisions at the same velocity, but there might also be additional contributions due to electron capture to excited projectile states. This effect, and the higher initial projectile temperature, may explain why the target appears to be less damaged (fragmented) than the projectile.